I think you'll have no problem clearing the non-heroic versions if you can do a regular heroic. I had an easier time with all of the ICC non-heroics than any of the regular heroic dungeons, period.

If you can do the ICC bosses on non-heroic, then you can do all of the heroic trash in the ICC dungeons. My 4x Rets are in full deadly with furious offset pieces and the 212dps 2h from Garfrost regular and I can clear all PoS heroic trash in like, 15 minutes tops.