Hello Ernesto, if you want to add different images to your skeleton, I suggest you also look into how to use skins:
Skins - Spine User Guide
You can drag the slots from one skeleton into the other while in setup mode and reassing the attachments to the correct slots, or you could simply use the new skins features, such as skin duplication, if you used the same names for each body part that should be replaced by a new one: