If we go to a model for a moment:
Turbulence is caused by sections of air moving up and sections of air moving down.
So we have a heavy aircraft at speed transitioning through a zone with an alternating updraft and downdraft.
From a physics perspective we could have an airplane of sufficient weight and speed that momentum would prevent the aircraft from being displaced. We would feel no “bumps”.
We could transition the same are with the same m/sec up and downdraft in a slow light airplane and it will “ride the wave” like a peanut shell in the ocean.
Proportionally different I’d say.
Unless I’ve got my physics wrong.