no. 1/100 scale means for every 1 inch of the model (or cm
if you go by the SI system), it represents 100 inches. If a
particular Gundam is 16m tall, the 1/100 scale model should be 16
cm. Hence, since not every MS is the same height, not every
1/100 scale model will be the same height!!!
Yeah... that's how the scale works, heights
of different gundams are usually reflected in the models.
But there's some cosmatic height differences between the same
models from MG and 1/100 though...
Other than that, nothing to worry about(height-wise)...