Models are scaled at 10mm foot to eye for figures and approximately 1/150 or British N gauge for vehicles. There are variations of as much as 3% due to the modelling and casting processes and the expansion and contraction or the materials. Models cast from the same mould will even vary slightly if metal, temperature, mould temperatures or pressure vary. When designing figures at this scale features need to be exaggerated for practical and aesthetic reasons, too thin and they would not cast or would break too easily, too fat and they look unrealistic. The test is; do they look like right, do look like they would fit in the vehicle and can I see with the naked eye what they are.
Will these models go with other manufacturers and other hobby areas?
They are 10mm but even that is slightly flawed as people have never come in standard sizes 1/144 models are within 4%, (some excellent plastic model aircraft and vehicles)
N gauge railway scenery is within 2%. (a vast range of inexpensive scenery)
For me the question is do i like the models and will they do what I want?