Help recovering edit

I edited a track and forgot to render it. I still have the original file, but renamed it (added it new to the library). Now Rekordbox doesnt recognize the original file, even if I rename it back to the way it was before.

I dont want to do all the work again :(
My guess is that rekordbox adds an id to each track in the library and once that is changed, it doesnt recorgnise the same track anymore. In the rbep-file it sais

"<song id="234225334" uuid="0798756f-2c9f-4268-95f5-d0072356cbe8">"



Any help with this?