Interchangeable, yes. Same part number, no. The front and rear turn signals have different length stalks.
Signal p/n's for 2G B6/12:
Fronts
RH 35601-31F10 (S Model)
LH 35602-31F10 (S Model)
RH 35601-31FA0 (Naked)
LH 35602-31FA0 (Naked)
Rears
Aft RH 35602-31F30 (both)
Aft LH 35604-31F30 (both)
For the 1G S models (US parts list doesn't show 1G Naked version):
Front
LH & RH 35601-29EC0
Rear
LH & RH 35603-21E30