Shape keys errors

Hello! I have 2 female base meshes with the exact same topology yet for some reason when I use one to generate a shape key for the other I get some horrific artefacts.

Before I knew shape keys were a thing I was actually blending vertex position inside of the game engine via looking at both meshing and Lerping vertex position and that worked fine so I’m at a loss why i cant do the same thing via shape keys. (The reason i want to move from the in engine system to shape keys is shape keys are WAY more efficient, old system was rebakeing the mesh every frame of the blended transission)

I ended up finding the issue it was Vertex ordering, here is the solution if anyone else finds this and has similar problems: