I asked them that same question a year ago...response below...
DEC 29, 2017 | 02:43PM CST
Hello we have received your email and the answer to your question is yes they are the same. thank you for being a Monster Moto customer. if you need further assistants please call 8558336483
DEC 25, 2017 | 12:08PM CST
Original message
Folks, are the frames for the 80cc and 105cc bikes the same?