Skeletal (bones) swapping from one body model to another body model

Hello,
i’m searching for someone who could help me with swapping skeletal from one body model to another.
Models are near the same, but one of these got different arms position.

Both of models got they skeletals and works fine in UE4. In ue4 i have some animations which are not working with the second model because of different bones name.

my blender knowledge is too small to do it.

At least i can pay a little money if there aren’t any volunteers.

Sorry for my bad english! :o

Here is model number 1 and number 2: