In other words, you are working on a mod for both versions of the game.
See: https://pzwiki.net/wiki/Mod_structure for more info.
Note on Non-standard images folder.
This folder is not included in steam-workshop uploads; it is useful for keeping raw images, psd files, larger assets that you may want to keep with your project but obviously don't want players to have to download.
Note: This is not a standard folder, and can be named anything.