This is a short video showing how to bring a TomCAT character from one file to another, including a pose library. This technique will work for pretty much anything.
Models Shown:
https://www.cgtrader.com/3d-models/character/woman/sara-rigged-woman-for-blender
https://www.cgtrader.com/3d-models/character/woman/imogen-rigged-female-dancer-for-blender-and-unity