Original Engine Manufacture (OEM)
JSR? Me no know
Limited Slip Differential (LSD)
You sound very new to this.....My suggestion....get yourself a OBD1 (On Board Diagnostic 1) B18B swap (LS, RS, GS Integra motor, trans, axles, shift linkage, ECU, mounts) This will definitely slide right into your 95 DX with no problems. If you get a JDM swap (Japanese Domestic Motors) you will need to use the Engine Harness on your DX (but it will work well) because JDM are RHD (Right Hand Drive) and their engine harnesses are reversed.
I had the B18B swap for 10 years in a 92 hatchback. I pulled on 5.0 Mustangs (manual) with this set up (header intake Exhaust) and hit high 14's (with good launch, driving, etc)
Cool thing is you can investigate a Frankenstein set up (LS/VTEC) later and gain a good 60+ hp with that conversion (VTEC top end). But you will need to educate yourself much much more before that.
GSR swap is very nice and more power.....plus Variable Timing Electronic Control but roughly twice as expensive as a B18B and a few wire mods need to be done to run it in your DX (because your car isn't VTEC.......do not say VTECH....thats a cheap ass cordless phone)