There will be minor differences in part numbers in any model year. For instance, the "AD" may change to an "AM". So an exact match is not necessary. You are looking for a ECM for a 5.9L Ram, you can use one for a 94 - 97, or maybe even up to 01, as long as it's for a 5.9L.
I'd get in touch with a Dodge dealer parts department and see if they can't tell you which part numbers work for your truck.