i broke my KO 75mhz Rx last night from accidently mistaken connecting the power +/-, so now i got KO radio+75mhz module and some 40mhz KO reciever that missing the module. Anyone know how can i use the different freq module to connect with my 40mhz RX..??? its seems that the module it self nothing different between 40 and 75mhz, only small sticker mention 40 or 75, and on PCB inside there some potensio? or VR? maybe i can tune it to match between TX to RX..
so anyone????

It's not the pot you would have to change the Osscilator and then re-tune.
Personally I would attempt this. too much at stake buy a new module.