When I worked the Manuals game, the engine MM was prepared by the engine guys as ATA100 Chapters 71,72 etc.
The tinbenders then incorporated these chapters into the AMM.
Thus, while it's engine data, it's issued to the airline as a combined AMM with engine, reverser, APU, landing gear etc. in digital form. (That said, the local engine rep might have a more recent revision of the engine MM in his private stock...)