@ShezAnEnigma007 I've split your post into its own thread in the Sims 4 forum, since the other thread was a few years old and apparently didn't answer your question.
Yes, you can play the same save on multiple computers, but you'll need to manually copy over your save. Your user data is located in Documents\Electronic Arts\The Sims 4: saves are in the saves folder, saved households and builds in the Tray folder, etc. These files can be swapped from one computer to another and should work fine.
So all you need to do is grab the save(s) you want from your Mac and transfer them to your PC. You can use an external drive or USB stick, if it's readable by both OSs; or you can upload your content to a filehosting site (Google Drive, Dropbox, whatever) and download onto your PC. It's best not to transfer entire folders, just the files inside them.
