KZ400 Wheel - Will it fit a KZ900?

Was the front wheel from a 76 KZ400 the same as a 76 KZ900? I am wanting to take a 400 front wheel and put my 900 rotor on it and bolt it right up.

i had a kz400 i parted out a while back with disc brake front end,its really small compared to 900-1000 axle is a lot smaller so is rotor.