The HPW from Critter Love is manufactured here in the states, therefor it uses ingredients approved in the States. You can find the ingredients and nutritional information on her website.
I have little information on the one from exotic nutrition, besides they have a good variety of them, so without you being specific as to which exotic nutrition you're referencing, there's even less I an tell you.
The there is the one from the pampered glider the imports the HPW from Australia found here:
www.thepamperedglider.com/supplements.htm
Which is different from the ones above.
Candy is a member here, and she knows more about the specifics if you wish to contact her directly and ask her.
Critter's Love HPW and the OHPW use similar ingredients, except for the vitamins and minerals supplements, because Critter Love have to used what is allowed in the states. I am not sure about the difference in quantity, but you can find nutritional tables for both.
Paswell's OHPW:
www.sugarglider.com/glidergossip/photo_album_view.asp?mid=3262&cid=358&page=5
(just click on "Data Sheet for HPW Powder from Passwell/Womberoo Company")
Critter Love:
www.critterlove.com/diet-info.html
Sorry I couldn't be more helpful, truth is I am very confused by them all as well.