Job: Need Model Merges

Good afternoon, I work for an SCP server and I would like to have some models (specifically their heads) be placed onto another model, to give it customization options.

The heads I want; https://steamcommunity.com/sharedfiles/filedetails/?id=2339330891

The models I want them on;

https://steamcommunity.com/sharedfiles/filedetails/?id=2177181299&searchtext=scp+medic

https://steamcommunity.com/sharedfiles/filedetails/?id=2191602279&searchtext=SCP+medical

This would require the SCP medical models to have a custom female model attached to both combat medic and scrubs