I have the first two models.
Since I have several Fine N Scale resin cars, I could not resist to put them in a train for comparison (changed full picture by thumbnail later) :
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The FVM cars are on the right, FNS on the left.
They are not _that_ different, and I feel not discuraged to build the rest of my resin kits
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The only question is what color I should use. So far I thought they should be Polly S Zinc Chromate Primer, the car on the left is Special Oxide Red.