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First of all welcome back here Dick, we have missed your nice comments. I have in my collection both crossover, orange model with round diff cover and the yellow model with square diff cover. But my yellow model has a painted shovel rivet.
Antonin

my yellow models:
- with square diff
- with red hubs
- with round diff
- with central triangular infill

Picture test

Two color


Orange hubs, gray tires


Red hubs, yellow body


Steve Beckett collection (with permission)

Shovel reinforcement


Bases


Real deal with attribution noted on photo

A view of the Hatras on display in my cabinet

In light of Christian's comments, the base/color combination of note could be considered rare. I know I consider some models as rare even though they turn up much more frequently in other parts of the world.