Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
ya, your headset and your friends headset are not designed for the same type of headtubes. since yours doesn't work and his does, i'm assuming, i would get the one he has.
the headset you have, and i have a few, is called a "1 1/8" traditional threadless headset", OTOH his is called an "integrated headset" as you and others have pointed out. NOT the same.
too bad, yours is cheaper.
life is a learning experience. be happy it's not an expensive mistake, like buying an engraved engagement ring for someone that morphs into a harpy after the purchase...