With enough time, effort, money it is possible .....but prolly not worth it cuz there are alot of differences to overcome in those two years.
Engine: LN3 165 HP 220 TQ
Motor mounts: 4 mounts (two motor, two tranny)
Engine: L27 170 HP 225 TQ (you would need to swap over wiring harness and ECM)
Motor mounts: 3 (1 axis, two tranny)
Prolly also need a custom intake. Theres only one oxygen sensor on your 89, the 94 might have two, im not sure though.
Hopes this gives you an idea of what it will take
1999-2007: ___1988 Bonneville LE LN3 (Vin C) @ 273,000 miles
and still going strong (<-Faded sun fried grayish ie needs paint)
2007-Present: ___1993 Bonneville SE L27 @ 210,000
Speeding around So Cal (<-Beautiful Forest Green)
Mods: Sylvania Silver Star headlamps. Remote start system with pageing device. K&N air filter. Tranny Cooler. High-flow cat with Magnaflow muffler. Full Class II hitch setup.