Whoa! Multiplex and Graupner make 4 different 12-channel radios with all 12 channels having equal resolution and refresh rates, and were doing so a decade before Futaba made the 14MZ.
As far as I can tell from Weatronics spec, we can't use the Weatronics because they don't have enough channels to match our 12 channel tx!!!

I am pretty sure you have got the JR 10 wrong. Its channels 9 and 10 update at the same rate, but they are 9 bit 512-step rather than the 10 bit 1024-steps of channels 1 to 8, so they are simply of marginally lower resolution.

H.