As Ross hinted the only real thing with a ridge is the new ring banging up against it and breaking.
Even if the new rings are at the same height as the old ones, they are new, grooves are new & less forgiving, so it could hit that ridge.
I'd make sure its gone first even if do it with sandpaper (BTDT, cheap way out).
If no risk of the ring hitting it, then it wont hurt anything.