Restoring Installation Pi-Top 4 OS On Pi-Top 3?

I recently replaced my older operating system to the newer version designed for Pi-Top 4 on my Pi-Top 3. Is there a way I can restore my system in it’s current state in case of future incidents with the software?

Hi @HydroPiTop,
The latest OS has been designed to be used on all of our past products including the pi-top [3]. There are a few extra features for the pi-top [4] though you’ll still be able to do all the things you used to do. Unfortunately, we don’t offer the older OS to download as it isn’t as stable and has a few bugs.

The only differences is that we’ve removed CEED Universe because we’ve stopped development on it and no longer any support.
Was there something specific you wanted on the OS?