Retarget non epic skeleton

I purchased this Cartoon Zombie Pack

and also picked up this smart AI pack

well, I didn’t read and the Zombie pack is not rigged to epic skeleton, so the bone names are super weird but they come with their own animations. But the Smart AI pack already has zombie AI pre-made, so I want to use the zombie pack meshes with the smart AI zombies.

Whats my best route? I tried retargeting the zombies to unreal mannequin, but the zombie bones are named like CATRIG00000Gkne2000003 and so on, so I have no idea where they go exactly. So could someone give me the best solution? Thanks in advance