Witness the 'thumb' of a panda, which is uses to strip leaves from the eucalyptus branch. It has a thumb (toe on its paw) but no, evolution chose to extend a wrist bone in a kind of protuberance; the panda pulls the branch between that and its arm to strip leaves. Not ideal; kinda weird really. But evolution doesn't give a flip.
So we get different populations with wildly different solutions to the same problem.