identisch
identical
Completely the same; matching exactly in all features and characteristics.
Die DNA-Proben der beiden Zwillinge waren identisch.
The DNA samples of the two twins were identical.

identical
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identical
Completely the same; matching exactly in all features and characteristics.
Die DNA-Proben der beiden Zwillinge waren identisch.
The DNA samples of the two twins were identical.

When comparing two things, 'identisch' (identical) is almost always used with the preposition 'mit' and the dative. The structure is: A ist identisch mit B (A is identical to B).
Dein Rucksack ist identisch mit meinem.
Your backpack is identical to mine.
When you want to say that several things are the same as one another, you use a plural subject. No preposition is needed then.
Die beiden Häuser sehen von außen identisch aus.
The two houses look identical from the outside.
'Identisch' (identical) can be modified by adverbs. 'Völlig identisch' or 'absolut identisch' means 100% the same, while 'fast identisch', 'nahezu identisch', or 'praktisch identisch' expresses a very strong similarity.
Die Kopie war vom Original praktisch nicht zu unterscheiden; sie war fast identisch.
The copy was practically indistinguishable from the original; it was almost identical.
immediate / same
'gleich' and 'identisch' both describe that two things match. 'gleich' is the normal, very common word in everyday language. It can also mean that things are the same only in a particular respect, for example that they have the same color. 'identisch' is more precise and stronger: it means that truly all features match. The word often sounds more factual or technical. If you want to say with complete certainty that there is no difference, 'identisch' is more precise.

Nach dem Update waren die beiden Dateien nicht mehr identisch.
After the update, the two files were no longer identical.
Für das Projekt benutzen wir das gleiche Programm wie letztes Jahr.
For the project, we are using the same program as last year.