Are you saying that if I had a kbin account instead of lemmy and mastodon, I could combine them two into the same?

But never buy the like new condition. Good is better in this case. I once saw a documentary about swappa using third party replacement parts to refurbish those phones which have far worse quality than the original parts

Edit: I confused swappa with swappie and managed to find thedocumentary I was talking about (it is in German though)