Dimensionally they are the same and will fit. The L version should work in place of the regular one everywhere except for the N5 and N5C Belted. There is no flat spot for the belt cog.
Structurally I would think it is equally up to the task except in a crash. May bend easier?? I know hollow verses solid shafts seem to be a topic of debate. Maybe Matt will chime in here.
Cheers
Alan