Should I replace a knob lock when replacing a matching deadbolt?
As the comments above pointed out, it makes sense to change both the knob and the deadbolt at once. Somebody also mentioned that Callan uses the Kwikset keyway. I confirmed that my key was a kwikset keyway and bought two Kwikset smart key knob/bolt combos from home depot. Using the smartkey feature, I was able to rekey the locks at my home to match my existing key. At about $90 total, this ended up being both a reasonably priced and convenient way to continue using my existing keys on all doors.

I still have callan knob/locks on 2-3 other doors, but they are much lower traffic and have not seen the same amount of wear. Should they ever break, I can replace them with a kwikset combo.