Daphne/Hypseus games.. how it's really works ?

On my home i have setup the 'ecosystem' of retropie (using retropie setup script) on my Ubuntu 22.04.3 installed on a Intel NUC.
From here i have successfully compiled the current Hypseus source and i have add some of games picked from @ViRuS-MaN
thread here:

https://www.retroroms.info/forum/topic/-Recalbox-Daphne-Roms.htm

Currently i have add Dragon's Lair 2 Time Warp and Space Ace directly from my Childhood memories......... apparently all works flawlessy but i have a lot of question about that.

Example:

For Space Ace i also know exist a 'ENHANCEMENT' version of same games..... my principal question it's. It's exist a different movie/audio set? Or the video/audio it's the same and i can use the same files from ViRuS-MaN thread ?

How this Daphne/Hypseus games really works ? About the folder system...... i can use anywant folder and all games need to stay in a specifical subfolders ?

Thanks for any info......