i did the same,
the store's chat confirmed its ok and iPhone's had the same policy as macs do.
they even said there were no restocking fees and apple would pay return shipping, IMHO i think everyone who is unsure should be doing this
unfortunately my 6+ won't be arriving till 16 Oct - 23 Oct but the 6 is slated for 19/9-23/9 (ordered at 320am :/ )