"It should not be confused with Tatar proper, spoken in Tatarstan and adjacent regions in Russia; the languages are related, but belong to two different subgroups of the Kipchak languages and thus are not mutually intelligible." https://en.wikipedia.org/wiki/Crimean_Tatar_language

The Crimean Tatar language is more similar to Turkish. It differs from Kazan Tatar in phonetics and intonation, and also grammar.