I think only one tank was built and it was photographed a bit. The Trumpeter schemes are conjectural. The tank would not have been grey.
You can see the gun tube, mantlet and vehicle seem to be different shades
If you are in the primer camp, then perhaps the tank or mantlet is in primer? The gun tube would not be in red primer at any rate.
There are some posts here about problems with the kit too... Trumpeter made some dumb mistakes.