I am new to Mac, so please don't come for me. But I was researching this vary question tonight an realized this is the exact situation I am in.
You actually CAN use the same email. Long story short, I had to completely reset my iPhone 15 plus due to forgetting the passcode. I changed the email and Apple ID to something else for a couple of weeks and thought I would try and create another account with the same one I had previously. They do allow that. Now I have been desperately trying to recover my photos, but they are not in the iCloud of the account using it a second time. However I just discovered tonight that my Apple Watch is still logged into the account from the first time. This is because I have not been using my Apple Watch since I had to reset my phone. Its been dead in a drawer until tonight.
I am in a delicate situation because I am praying there is a way to access the account from the Apple Watch, which is the original account that has all of my photos. I am beyond STRESSED!!! If this makes any sense