Yes, I'd agree that they are MSG.
Of course, I was concentrating on 2 Group aircraft, and this, and some units from other Groups, would often jettison the tanks, if or when fitted in place of the wing bomb racks, so not worth re-painting them in the relevant colour.
Other units, such as Intruder, PRU and probably bomber, would more than likely have the tanks 'semi-permanently' fitted, to extend range or 'loiter time', with little need to jettison, so would make sense to have them in the camouflage colour.
Good catch on the cammo demarcation on Bannock's aircraft.