Learn Italian: Il duplicato stesso coincide con la versione precisa. - The duplicate itself coincides with the precise version.

This placement changes the meaning. When stesso comes before the noun, it means "the same" (for example, lo stesso duplicato means "the same duplicate"). When placed after the noun, as it is here, it adds reflexive emphasis and translates to "itself" (il duplicato stesso equals "the duplicate itself").

Could I use medesimo here to mean the same thing?

Yes, il duplicato medesimo would also mean "the duplicate itself." Medesimo follows the exact same placement rules as stesso, but it sounds slightly more formal or literary. In everyday Italian, stesso is much more common.

Is coincidere con a fixed verb-preposition pair?

Yes. Just like in English, the verb coincidere (to coincide, to match exactly) requires the preposition con (with) to introduce the thing it matches.

Why does the adjective precisa come after versione here?

In Italian, placing an adjective after the noun gives it a literal, distinguishing function. Here, la versione precisa distinguishes this specific version from an imprecise one or a rough draft. Placing it before the noun (la precisa versione) would sound unnaturally poetic for such a technical, exact statement.