So basically, it is exactly the same part, just wrapped up differently?
In nearly all cases, yes. There are one or two cases where OEM parts are not identical with aftermarket parts with the same name, but more with finishing kit (bars. stems, seatposts) than main groupset components, and at the bottom end of the market, which probably isn't the level you're shopping at.
In nearly all cases, yes. There are one or two cases where OEM parts are not identical with aftermarket parts with the same name, but more with finishing kit (bars. stems, seatposts) than main groupset components, and at the bottom end of the market, which probably isn't the level you're shopping at.