Can you use the 93 L manual pedal assy and slave cylinder to operate the clutch fork on the jdm tranny or do you have to use the hydro setup from 02 wrx?

yes. you do not want to attempt to put the pedal box out of a GD body into a GC though as there are fitment issues.

yes. you do not want to attempt to put the pedal box out of a GD body into a GC though as there are fitment issues.

Nothing too severe, its entirely possible to use a GD pedal box in a GC.

So its recommended to use the US cable operated slave cylinder than try to fit a 02 WRX pedal box?

Use the 2.5 RS pedals, master and slave, it's all hydraulic. Also,get a SS braided hose for the master to slave on ebay for $30-40, it improved the clutch feel alot. It was the difference between notching gears on stage with fast shifts and never grinding with a HD pressure plate

I've seen pictures on here of GD pedal boxes modified to work in the GC.
There were a couple of holes that didn't line up correctly in stock form.