Combining Metahuman + Custom Character

Complete newbie here with just basic understanding of UE5

So I have made a Metahuman and wanted to combine it with a custom character model that I got from the Artstation. Problem is, my metahuman and the base model are completely different + the base model comes with a face that ideally I’d want to replace

How can I attach my metahuman body to this model and replace the face of the custom character with my metahuman’s one? Please help