Für das Röstprofil macht es einen Unterschied, ob wir nachrösten.

It means it makes a difference.

This is a very common German expression:

• einen Unterschied machen = to make a difference

So:

• Es macht einen Unterschied, ob wir nachrösten. = It makes a difference whether we re-roast / continue roasting.

The es here works a lot like English it in it makes a difference.

German often uses a placeholder es in sentences like this.

The real content is in the ob clause:

• ob wir nachrösten = whether we re-roast

So the structure is roughly:

• Es macht einen Unterschied, ob ...
• It makes a difference whether ...

The es does not refer to a specific thing like the coffee or the roast profile. It is just a grammatical placeholder.

German often puts the most important or topical information first.

Here, Für das Röstprofil means:

• for the roast profile
• more naturally in English, often for the roast profile or as far as the roast profile is concerned

By putting it first, the sentence emphasizes that this difference matters specifically for the roast profile.

A more neutral order would also be possible:

• Es macht für das Röstprofil einen Unterschied, ob wir nachrösten.

Both are grammatical. The original just foregrounds Für das Röstprofil.

Because German main clauses follow the V2 rule: the finite verb comes in the second position.

In this sentence, the first position is taken by:

• Für das Röstprofil

So the finite verb must come next:

• macht

That gives:

• Für das Röstprofil | macht | es einen Unterschied, ob wir nachrösten.

This is one of the most important word-order rules in German.

Because Unterschied is the direct object of machen, so it is in the accusative case.

The expression is:

• einen Unterschied machen

Since Unterschied is masculine (der Unterschied), the accusative singular form is:

• einen Unterschied

So:

• ein Unterschied = nominative
• einen Unterschied = accusative

Ob means whether.

It introduces an indirect yes/no question:

• ob wir nachrösten = whether we re-roast

Why not the others?

• ob = whether
• wenn = if/when
• dass = that

So:

• Es macht einen Unterschied, ob wir nachrösten. = It makes a difference whether we re-roast.

You would not use dass here, because the idea is not that we re-roast, but whether we do or not.

And wenn would change the meaning. It would sound more like if/when we re-roast, not whether we re-roast.

Because ob wir nachrösten is a subordinate clause, and in German subordinate clauses the finite verb normally goes to the end.

So:

• ob introduces the subordinate clause
• wir = subject
• nachrösten = verb at the end

This is standard German word order for subordinate clauses.

Yes, it is treated like a separable verb.

In a main clause, you would typically see:

• Wir rösten nach.

But in a subordinate clause or with an infinitive, the prefix stays attached:

• ..., ob wir nachrösten
• ..., weil wir nachrösten
• nachzurösten in an infinitive construction with zu

This is the same pattern as verbs like:

• mitkommen → Wir kommen mit. / ..., ob wir mitkommen
• einkaufen → Wir kaufen ein. / ..., weil wir einkaufen

It means something like:

• to roast further
• to roast again
• to continue roasting afterward

The exact English translation depends on the technical context.

The prefix nach- often has the idea of:

• after
• later
• in addition
• again/further

So in a roasting context, nachrösten suggests an additional or later roasting step, not just the basic act of roasting.

Röstprofil is a compound noun:

• Röst- = roasting
• Profil = profile

So das Röstprofil means the roast profile.

German uses compound nouns very freely. Instead of writing several separate words, German often combines them into one noun.

Other examples:

• Kaffeebohne = coffee bean
• Röstgrad = roast level
• Temperaturkurve = temperature curve

The last part determines the gender, so because Profil is neuter (das Profil), the whole compound is also neuter:

• das Röstprofil

Because the preposition für always takes the accusative case.

So:

• das Röstprofil is both nominative and accusative singular because it is a neuter noun
• after für, you must use accusative

That gives:

• für das Röstprofil

With a masculine noun, the change would be easier to see:

• der Unterschied → für den Unterschied

You can do a rough literal breakdown, but the natural English wording is smoother.

A close literal mapping would be:

• Für das Röstprofil = For the roast profile
• macht es = it makes
• einen Unterschied = a difference
• ob wir nachrösten = whether we re-roast / continue roasting

So the whole sentence is roughly:

• For the roast profile, it makes a difference whether we re-roast.

That is understandable English, but a more natural translation might be:

• It makes a difference to the roast profile whether we re-roast.
• Whether we re-roast makes a difference to the roast profile.

Yes, that is also grammatical.

This version puts the ob clause first:

• Ob wir nachrösten, macht für das Röstprofil einen Unterschied.

That means:

• Whether we re-roast makes a difference to the roast profile.

The meaning is basically the same, but the focus changes slightly. This version emphasizes the whole question whether we re-roast. The original version emphasizes the roast profile first.