You have to give him more time. He only post once per year. ;)
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The images are a bit small but I'll guess PR64 to 66
66
They do look like they belong together. Same dealer, both NGC and I'm so far upside down on both a 20 ft ladder would not help. ;)
Is it possible that the owner of the coin had a reserve set and bought the coin back?
None above 67.
64
They picked a strange spot to add back the initials. Most initials are in a flat field. Worn or filled dies will hide them.
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You don't see many half dollars with such a bold clash. They were common with the bust coins but not with the Kennedy half.
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Nice clash. I would put it in some type of holder to keep it safe. Having it graded would cost too much.
Separate names with a comma.