They are the same filter.
I think it's one of those cases where the two companies have them made and labeled accordingly. Not sure, there is a possibility the RedSea owns/bought AZOO and therefore feels no need to keep making two models of the same filter. Who knows. But it is the same filter.
As for media, just make your own if you can't find it. You could buy one of those big carbon coated filter pads and cut it up into small filters for it. Or just cut a strip to drop into the chamber. It would be easier than trying to use a bag and one pad would last a long time.
I just ordered one of the azoo myself and that's what I plan on doing. Just cut replacement filters out of the carbon pad and when they get dirty... toss em. I figure at 10x18, changing the pad every 3-4 weeks.... I should be good for a year at least. lol