I am not saying you couldn't make it work but the frames are slightly different as well as the mounts on the engines.
these are from kymcopartsonline.com
Agility 50 mount bushing 11102
Agility 125 mount bushing 11102
Agility 50 – Body Frame – 50100-LDC8-E10
Agility 125 – Body Frame – 50100-LDF7-M30