All 2st Will a 19" cr125 rim/hub set work on a wr300?

So I'm wondering if my 14' 125 rim will fit on my 14' 300? I was looking to use a 19" rim on my 300 to mount an ice tire up. From a couple rough measurements the hubs look almost the same width +/- 1/8" the trouble is the rotor since the 19" is larger I will probably have to swap the rotors. Not sure they will swap perfectly but thought I'd throw it out there and see if anyone has tried. I have the spacers off the 300 rim to use (both sides) thanks!

The rotor on the 300 is smaller. Zip ty sells a mount and shark fin to fit the bigger rotor. I bought everything from Halls. That's all I can help you with. IDK if the hubs are the same between the two bikes.

Yes it will fit, just put the rotor from the 300 on the 125 wheel and you are good to go.

Thanks for the replies! I'll give it a whirl! I didnt realize zip tie made a "big Rotor" kit so thats cool.