As far as I know, the chemicals work the same way. The bulk concentrates that kodak sells are considered replenishers, which are to be added to already used or 'seasoned' chemicals. The bottles of starter are used to turn the replenisher into a usable developer, bleach, etc. IIRC, the starter is not quite essential for the bleach or fix steps; it only matters for the developers. To some extent I can confirm this because I use C41 bleach replenisher sans starter without problem.
There was a pdf somewhere that showed how to mix smaller amounts of E6 chemicals from the bulk concentrates.