Just wanted to add that it's also easy to keep most of the encoded address the same while changing the hash completely, for example :

FFE70FB0B47E80EBDC1CC4C3C59581110A10D52B
0469804540E7B2C646007EFA8C3BF4FBE146E931

Will result in :

1QL67LXU5LS8uoKCXDAy4bbgWY7ue2nHTA
1QL67LXU5LS8uoKCXDAy4bbgWY7uJFBhq

Of course it's hard to do this trick if I have to right-align the addresses