I agree that they are the same person, but I also see the differences cited as reasons for rejecting the merge proposal, although the differences are very slight. In addition, I see that the birth dates differ slightly.
These differences need to be resolved in order to complete the merge so that the correct birth/death dates/places will be on the resulting profile. If you know (or can find) the correct information then you can make the corrections and propose the merge again. After that, there will be no basis for anyone to complain about it!
About your other question - any member can propose a merge, create a match, or reject a merge for any profile(s). That's part of the collaboration here.