Mobile Assets vs others?

Hey I’m new to mobile development and was wondering what the difference is between mobile assets and higher end assets for PC? I’m wondering because there’s many assets I would like to use but they are for PC, and if I’m just able to buy those and downgrade them that would be great. If its just the polys and textures cant I just downgrade the textures and make a min LOD for the assets to lower the polys?

The icons on the marketplace products and ‘supported platforms’. So you’ll often find the only icon is PC, and yet the product would work on other platforms.

If it’s just meshes and materials, you’ll -probably- be fine for most platforms. But avoid Nanite, obviously.

For mobile, everything has to be simplified, so bear that in mind.