A lot of the girls got changed out in 0.7.0 and they will only be coming back in fan made nostalgia mods or if someone releases/finds the old character cards to recreate the new scenes.
Some info about the old character cards
https://f95zone.to/threads/corrupted-kingdoms-v0-7-5-arcgames.31912/post-4080639
Though the one that made it into the Credits was the dev of
Future Fragments and their main character named Talia (which was Chloe's old model).
When the models changed out CursedFlame91 made a pdf comparing the old and new models. That evolved into a Character Poll later on.
https://f95zone.to/threads/corrupted-kingdoms-v0-7-5-arcgames.31912/post-4206963
Are you sure you aren't mixing games up? Can't recall
Corruption of Champions being mentioned. In
Champion of Realms there was a little extra scene thrown in, secret code ' Invasion', since some fans were giving that dev grief. It's a rather funny scene that even included the Fox Girl, originally called Yanoka Chichii by Neptune, that Arc teased about getting into the game someday™ before things happen.