Can a 2003 Honda Civic Lx transmission fit on a 2002 Honda civic Ex?

the ex has moonroof , power seatbelts , and the lx doesnt, theres not much of a difference between those two, but the engine is also different, Ex has a v-tec engine, whereas the Lx doesnt, so the Lx...

bolted to the engine....

hard to tell without more information, but more than likely, yes it will

Yes it can.

No it will not. 2001 and up Civics use entirely different motors.