Let me try to make my point a little more clear. The fact that humans are more similar to chimpanzees (on the macroscopic and the molecular level) than they are to baboons is something that a responsible doctor should have taken into account before he undertook his risky experiment, regardless of his opinion on common descent.
No, there is no non-evolutionary rationale for that bit of apparent common sense.
God had no need to create biochemical similarities to match the phenotypic ones. Think about covergent evolution for a moment and you will realize that.