howdy pettsy, good to see you on the forum, i have this same problem, i cant help but get concerned with mine aswell, i am going to try messing with the wiring so when the switch turns on speed 1, it will infact turn on speed 2, and i cant see any harm with this, especially over the summer months, hell ive never heard of any under heating problems!!
but in reply to your question, i think they are the same fitment...