Check the gear ratios, in case you need the rear diff.
Yes, starter is different. Flywheel bolts are longer, too, although those are the same as EJ, probably can get them right from Subaru.
Front half of the drive shaft, at least. Though, if you separate the halves, you should rebalance the assembly. Easiest to just grab the whole thing.
That should be it off the top of my head (grain of salt, the 3AT->5MT swap I did was about 15 years ago).
Only MPFI in that vintage was a turbo. And only Turbo/dual range combo was the RX Coupe. Fairly safe bet that GL Wagon isn't.