I have a bunch of runs that I've been doing over the past month or two, are these valid submissions? Additionally, what should I do about runs on past versions of Gallery Collab? All runs were on latest version at the time of running but the mod has been updated since some of them.

All runs prior to the creation of the leaderboard will be accepted yeah, gameplay changes are fairly minimal and it is quite hard to verify exact version number for this collab anyway.