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Forget how many keys, delete the key resource file and it should start fresh. In Linux it should be in .ssh directory in your login's home tree. Mine is called known_hosts and upon looking at that file I'd not recommend trying to edit it; however deleting it means that other hosts which were previously accepted will be reset too.
My variation only has known_hosts and I delete that file only. However to be safe, you could copy that whole directory to another place so as to be capable of restoring, and then delete the known_hosts file. It would seem intuitive to remove the authorized_keys file; just that my local experience is that I solely have known_hosts. I also only ever do is scp.
By the way, this is on the "source" system from which I perform the scp. I.e. if I'm on system B performing and SCP to system A, I delete the known_hosts file on system B and the next action of trying scp causes the shell to give me the message that the authenticity of the other host can't be established and asks me if I want to authorize and continue.