Dunno what version the first 2 you have are exactly, but rough story is 0.7.5 was the last release of the original unreal 4 version, before they wanted to switch to unreal 5 due to extreme spaghetti code. Switch to unreal 5 (0.804) didn’t go well, as a rebel dev kinda took over and mucked things up, so they refreshed team, chucked outa final unreal version (first nights), and went with unity instead. Current Version is unity.
Honeymoon is completely different game, sorta spin off, same characters, different gameplay.