WK163 is officially designated B Mk 2/6 in the aircraft documents both civil and military (F700) and all the approvals and releases are for that mark of Canberra from the day it was modified at Pershore. It was never in "proper service" with the RAF so does that make it a non existant type?
The SC9 designation for XH132 must list as a sub type as it retained it's military seriel during all of it's life. Incidentally the PR9 has a powered rudder as well as ailerons.