It seems to me that Hot Toys likes to re-release their figures with added value -- a different/new head, one or more new items, a variation of painting sometimes. For their Battle Damage/color variation figures, they seem to come out at nearly the same time. I'm guessing that it's cheaper for them do it that way. Their Superman seems to be an interesting type of re-release as they have come out later with drastically increased value-added content and months and months later.
I think they'll re-release some and not others but rarely as identical re-releases.
I think they'll re-release some and not others but rarely as identical re-releases.