If you want matching barrels it's possible Chris - dismantle the non matching lock by removing the tumblers that are proud and move them to the other non matching slots until you get the best match of flush tumblers with the key in the lock. Some you can probably get completely flush but those you can't just file down flush with the barrrel with the key inserted. Once the key is removed the remaining parts of the tumblers should pop out to lock the handle.

Guy