Scaling between different graphics cards different?

Using 5.3.1f1 I have an environment with ordinary houses. In my editor PC (with a GTX980Ti) with Rift DK2 the scaling of the first person (default prefab) looks fine, both in the editor and in the build version (64bit). But after copying to another PC (also using the DK2) the first person seems smaller. I can walk too close to a wall, enabling me to look through the wall (not using the positional camera of the Rift!) and my eye level is clearly 20-30 centimeters lower.
The only difference...

Scaling between different graphics cards different?