Could be wrong but I would think the vanish would be the same material, but not a bad marketing ploy, Get less for more.
I have been using vanish (in line length spools) for all my leaders for a number of years and find it very good, It is stored in the bottom of my tackle box so it is not exposed to sunlight, at this point it seems not to have deteriated.
looking around the fishing tackle shelves there are more spools of so called leader material appearing, I would think that a lot of the cheaper unknown brand names would be coming from the same mono line manufacturer off shore and being packaged as this or that.
Howard