No, they're not the same. Here's something I wrote awhile back:
North American jewelweed (sometimes called Wild Celandine among other names) is used as a folk remedy to treat poison ivy dermatitis. This would be Impatiens pallida (yellow jewelweed) or I. capensis (spotted jewelweed). I have yet to see this herb being sold on the market in dried or extract form. Dried jewelweed loses its efficacy -- it's the wet sap that works. Oil infusions don't work well either -- too much jewelweed sap in oil just makes a moldy mess. Most people make a tincture of jewelweed and water or witch hazel and refrigerate the tincture. Or they freeze chopped up bits of the plant into ice cubes and rub the ice cubes on affected skin.
The stuff in the MMS link is an extract of Impatiens balsamica, a plant native to Asia. It has a history of use in folk medicine, but not for poison ivy.
http://en.wikipedia.org/wiki/Impatiens_balsamina
Another herb mistaken for North American jewelweed is Greater Celandine, Chelidonium majus. It is sourced from Hungary and native to Europe. It is a member of the Papaveraceae (poppy) family. According to the references I found, it is poisonous if ingested, and it can be irritating to the eyes and skin, although it was used traditionally to remove warts. Last time I checked, this is what Starwest is selling.
http://en.wikipedia.org/wiki/Chelidonium