To the best of my knowledge, you can justify either. Vehicles in SCC 2 were not supposed to be repainted in SCC 15 until they
needed a repaint due to the condition of the existing paintwork, so if you finish it in SCC 2 I would certainly believe that for a vehicle in 1944. By 1945, maybe the same vehicle could have been repainted? But at the same time, you can also argue for a vehicle that needed a repaint in mid-1944 for any number of reasons.
IMHO: pick the one you like best. And whichever of the two you choose, your model will stand out against other British Second World War vehicles because it isn’t deep bronze green
