They're not the same, they apparently have less of the active ingredients.
However, how much less he is "unwilling to say." I remember Bryan putting this question to him. To check out more about his stuff visit the "ask the experts" section on hairlosshelp.com, where he has been asked countless questions such as these.
I asked him if his prox-n stuff from lef.org was the same and he said
"no, it's a lite version. However, it is a somewhat better deal for the money. So if cost is a consideration, use the lef product."
I opted for prox-n, mainly for peace of mind. However i might change, im not sure.