Homies & NPCs Could I Get A Quick Rundown On How To Do Character Swaps (Model Swaps)?

Say I wanted to replace Gat With Veteran Child or A Fight Club NPC with a Brotherhood Member? How is it done? Where do I find the model names as well? Also could it be possible to have the player character be another character in a cutscene? Could i Have the player character's model take the place of Maero for example?