Re: Sims4 Origin to EA
@RiHa04 All of your data should be intact. Saves and mods are stored in the Sims 4 user folder, the one in Documents\Electronic Arts, no matter what kind of install you have. The EA App won't interfere with this folder any more than Origin does. GShade files are stored within the game's program files, so you might run into trouble if you try to repair the game, and you'd certainly need to reinstall GShade if you also ever reinstalled Sims 4, but otherwise, those files should remain as well.
By the way, Origin will be around for a little while longer, so it's fine to put off the switch for now.