Only downloaded step 1 anking, want to add step 2 without changing my edits to step 1 cards

I have been studying anking step 1 and making my own edits to this deck for over a year. I now want to start studying for step 2, so I need to download the anki overhaul deck that contains both step 1 and step 2, but I can’t find a clean way to do that without messing with my current step 1 deck. I tagged all my unsuspended cards from step 1 and put that tag in the protected fields box, but it still made changes to my cards. If I choose any fields where I may have made edits to protect (text, answer, images, lecture notes, etc), won’t that prevent ankihub from being able to add these fields to the new Step 2 cards that I need in my deck?