>>10163946yes they fucking do.
the prototyped MG F90 shown in the Gunpla Expo was made with a customized MG F91 1.0 frame, which is also used by MG Crossbone.
then MG F90 mothballed. and eventually released with using a modified MG F91 v2.0 frame.
Also, FUCK BANDAI for already having a MG F91 v2 frame and not releasing MG Crossbone v2 using a MG F91 v2 frame