Learn Russian: Запах этой кожи такой же, как в магазине. - The smell of this leather is exactly the same as in the store.

такой же acts like an adjective, so it changes to match the noun it describes. Here, it agrees with the masculine noun запах (smell). You use так же (which is an adverb and never changes form) when you are comparing actions or describing adjectives, like saying something smells just as strongly.

Why is there a comma before как?

In Russian punctuation rules, you almost always need a comma before как when it introduces a comparison clause. This is different from English, where we would not put a comma before the word "as" in the phrase "the same as".

Why are the words этой кожи in the genitive case?

They translate to "of this leather." The genitive case is used to link two nouns together to show possession or association, exactly like the word "of" does in English. The feminine pronoun эта changes to этой, and the noun кожа changes to кожи.

I learned that кожа means skin. Can it also mean leather?

Yes, кожа is the word for both skin and leather. You have to rely on the context to know which one is meant. Since we are talking about a store and a specific smell, leather is the clear choice here.