Here are the differences between a B13 SE-R and the other B13 models:
- Somewhat stiffer springs (132/109 lb/in).
Somewhat stiffer struts.
Rear disc brakes.
Different cloth on the seats.
SR20DE and its transmission and limited slip differential. I think the axles have different splines to fit this transission.
Fog lights.
14"x5.5" alloy wheels with 185/60-14 tires. 14"x6" were a dealer option.
Solid front anti-sway bar; the rear bar may be slightly larger.
2-door only
SE-R badge on trunk lid
Tail lights
These are all direct bolt-ons for any B13. Any 2-door model can be turned into an SE-R that only a VIN search could tell wasn't an SE-R.
Same differences apply to B14 Sentras and SE-Rs except for the 15" wheels.
B14 2.0 SE is unfamiliar territory for me, so no comments.