A couple reasons actually.
The engine in the 89 does not run due to the accident it was in so I have no idea at this point of what (if any) damage was done to the electrical system.
To me putting a used chip and injectors on a rebuilt motor would be equivelent to putting a used oil pump in a rebuilt engine. Although the chip and injectors arent nearly as critical as oil delivery I figure why even mess with the used stuff. Also the 89 has a manual trans and different gearing then my 88. Im not even sure that has anything to do with the chip but again I have the thought of why even chance it that it may or may not work correctly with my setup.
Yes they are both TBI.