No. 90-93 is an entirely different series of chassis than 94-01. However, any 94-01 model's tranny is interchangeable as far as I know - although there *might* be a difference between GS/LS (non-vtec) and GSR/Type R transmissions, even though the engine block is relatively the same from model to model. There are some other transmissions that will mate up to the engine, but anything outside the model year/s will require extensive modification to install and be a significant downgrade to OE equipment in most cases.
No, 90-93 was cable operated, 94-up was hydraulic.
No.
No
Yes it is the same thing.
No
yes
No 94-2001 are a different body style and will not fit.
Places like the Ground Control website don't list their coilovers for 91-93 Integras and 94-01 Integra being compatible. They may work, but I won't gaurantee it. So short answer no, but the long answer is that yes you can if you mix and match components off of a 92-95 Civic (uses similar parts as the 94-01 Integra, and they are more common in junk yards) with your car. It depends how much you want the 94-01 Integra coilovers. Check someplace like hondatech.com for more help.
No integra has wider angle
yes it can just make sure everything lines up befor u drop it in...
integra DA is just the "code name" i guess you can say of a 90-93 integra. for example, DC2 is for 94-01 integra, DC5 is for the RSX....etc....
Plymouth Laser 92-94 and Mitsubishi Eclipse 93-94 for the 2.0L engine.