Are OBDl and OBDll codes the same or is the code numbers have different meaning to reference to different problems

do an online search of obdll codes and also obdll codes [your make of vehicle ] their are also specific codes just for certain vehicle makes

codes OBDll and available on free.
example P1516 code
https://www.way.com/blog/p1516-meaning-symptoms-causes-and-fixes/

https://www.engine-codes.com/p1516_chevrolet.html

https://www.troublecodes.net/p1codes/p1516/

I am not sure if the ECM would be directly compatable, but both a 1997 and 2002 used the Series II 3.8 You could only go off of the service numbers on the ECM itself.

codes are OBDll and are available online free
try googling your code.

A P0354 code means that the ignition coil or coils are not functioning properly and that there is an electrical problem with them. The ignition coils are responsible for properly igniting the air-fuel mixture in the engine's combustion chambers. If a vehicle has a P0354 code stored, it will not be able to ignite that mixture with the correct timing, and the engine will run roughly and/or stall.

A good chance that your car does NOT have one. OBDll was not required by law until 1996.
Some manufacturers had there own systems before then.
I found the following web reference:

"Sorry fellas, the 1989 XJS has no onboard diagnostics at all. It only has a red feedback monitor hookup [with a blanking cap] back near the fueling ECU in the boot. It was used for mixture setup and that's pretty much it.
The trip computer fault code readout didn't arrive until 1992."
The trip commuter readout he refers was a way to get codes (after certain steps taken) to show up in the trip computer display.
For OBDll compliant cars .... the port has to be within 3 feet of the driver with full access .... usually under the dash
Helpful?

OBDl is under the hood , drivers side. OBDll is under the dash on the drivers side. Beside the steering column

!985 Corvettes are not OBD2 systems, you need a early GM scanner to read codes or you can do it manually. Just google "code retreval OBD1 GM cars". Youtube will have it as well and take the scanner you have back.

The obdll code can only be reset by an obdll scanning tool. Did you repair the problem? If not the code will reappear & some mechanics will refuse to do repairs because they can not necessarily guaranty their work. The simple answer is go to a parts store, have them read the code, then have them erase it.

in 1995 it was optional for car makers to use either OBDl or OBDll computer systems, if yours is OBDl it's under the hood, 14 pin connector on one of the strut mounting nuts, if OBDll pull out your ashtray and it will be there

Was it made in Canada? Late model 95 right? Its a OBDII, check the manufacture dates on the inside of the drivers door it will tell you.