What will happen?  Parks loads but all custom content missing?  Game freezes?  CTD?

I have the default game installed on an old laptop, runs fine.  I copied my saved files from my old gaming rig (ate its mobo) but many of those parks had custom content, should I bother adding them to a default install?

The game will crash in the loading screen any custom content is missing. I don't think there is a tool to see what CC each park used.

Thanks. Guess I'll have to excavate the files from that old HD because I'll never remember what mods I'd installed.