Sorry guys, but you are both wrong.
1. The first two pictures show a Ju 88G with BMW-801 engines. This could either be a G-1, or indeed a G-6a or G-6b, one would have to check with the WerkNr. It is probably a G-1 though.
2. The G-6a, b, c designations are not postwar inventions. The a and b models were equipped with BMW-801.
Now I am recollecting the following from my memory but even if not 100% correct, it was something along these lines (will look it up on the weekend for you):
G-6a were produced in Bernburg with BMW engines and WerkNr. starting with 62...
G-6b models from Dessau with BMW engines, WerkNr. starting with 72...
G-6c models were manufactured in Bernburg with Jumo 213 and WrkNr. starting with 62...
3. The last picture seems to show a G-7 (Ju 188 pointed wing). Now with the G-7, the a, b, c designations are indeed postwar inventions.
There were only 10 or so G-7 produced, and it is unlikely that any saw service, and it is extremely unlikely that they did so with NJ-Staffel Norwegen, which btw was stationed in Lister (with a detachment in Gardemoen (Oslo)) until the end of February 1945, when it was redesignated 4./NJG 3 and based at Kjevik (Kristiansand) until the end of the war.