Now then. If we take an average person of 1,80m height then in 1:32 he would be 56,42mm tall. In 1:35 he would be 51,42 mm tall. That of course is overall height. With a sitting person we have to take proportion into account. When one considers that a human has a height of 8 times the distance from top of head to chin, and that the half way mark is the hip joints being 4 heads from the floor then we can calculate the rest.
In 1:32 a head height is 7.03mm so from hips to top of head is 28,12mm.
In 1:35 a head height is 6.4mm so from hips to top of head is 25,6mm.
Here we se that the seated height difference between 1:35 and 1:32 is a mere 2,53mm (or just under 1/8 Inch in old money)
I recon that your figures exceed these paramenetrs and one of them is not to scale. But you will have to measure that.
Hope this helps.
