The engine computer on my 1992 Caravan broke and was replaced by a 1994 one.

What is your question?

The van is running fine, but the 'check engine' light is still on. Is it important to have the exact year part? I am currently on a remote island and have little access, although someone did offer me a 1991 engine computer that looks similar to the original. I could also order the 1992 part if it's best to have the exact year match. Thank you for your help!