Transfer bones from one Object to another (same meshes)

Situation:

Mesh1: T pose, skinned mesh with bones, bone weights, bindposes

Mesh2: Random pose, normal mesh (no bones), same amount of triangles than mesh1, actually it's almost the same object but different pose without bones.

I transfer the bones with a script so Mesh2 now has bones, boneweights and bindposes. The problem is, the bone for it's hand says that it is (for example) at position: 2,0,0. This is true for Mesh1 but Mesh2's hand might be on 1,4,2. The problem comes when I want to rotate the hand (with an animation, using it's bones) because it's pivot isn't correct.

Is there a way to fix this pivot?