I don't know anything about keys/locks, but I've compared them and its ridge pattern is different than the original key to my door. Both of them work on the door however.MrStab said:It would be the same model lock I would think.
I've also tried opening his front door with the key to my house and it doesn't work, so it's not that we have identical locks or anything.
It's just that key. Somehow it opens both doors.