It should be fine.
I've done it many times with no problems.
Someone will correct me here if I'm wrong, but as far as I know you can use completely different content right through both galleries on a freesite
as long as it all fits the niche.
I've promoted four different hirsute women on the same freesite with no problems getting accepted. 6 or 7 photos for each model.
24 photos of 24 completely different cumshots actually fits the cumshot niche better than 24 photos with a few of them showing the build up to the cumshot.
Then again, I'm not a reviewer, and some reviewers might look at it differently.