Let's see if I can shed some light on this without confusing anyone too much...
The original Joyetech eGo came with two different types of atomizers ( Type-A and Type-B ) and used poly filled cartridges. The Type-A atomizer was a cone shape and the Type-B was cylindrical and held more liquid than the Type-A. Unique to the eGo was it's battery which has a hybrid battery connector which allows the use of standard 510 type atty's, carto's and/or clearo's on it's inner set of threads.... or the eGo type of threads found on it's outer surface.
On the Type-A and B atty's... the "cone" is integrated into the atty so a seperate piece isn't needed to clean up it's appearance. Many people still chose to use standard 510 type devices and for these there are additional cones available that give it a similar appearance to the Type-A atty.
Then came the eGo-T which uses a tank in place of the poly filled cartrige.... The Type-A and Type-B styles of tanks were/are still available and mimics the appearance of what the original eGo used even though these were not poly filled cartriges. These new tanks can't be used on the old Type-A or B atty's, they require the newer type of atty in order to work. The battery was unchanged basically.... so you could use the same battery on both the eGo and eGo-T.
The eGo-C then came out which made minor changes to the eGo-T... The biggest difference is the atty and cone are now sold as seperate components so when you need to replace the coil in the atty... you only had to purchase a new coil instead of a complete coil/cone assembly.... The battery got a minor update which adds a segemented LED so the user knows how much charge is left in the battery. All of the batteries are still interchangeble with each model.
The only change ( that I'm aware of ) with the eGo-Twist or eGo-VV is in the battery itself which allows variable voltages to be selected... Again, this battery is interchangable with the previous models.
Ok... The Vision Stardust is an eGo compatible clearomizer which requires that the battery it is connected to use eGo type threads ( the outer threads on the eGo batteries ) or an eGo thread adapter if you are not using it on an eGo type of battery. The Stardust doesn't require any additional cone to be used. So it doesn't matter whether the atty's you were using were Type-A or Type-B since they are not used when using a Stardust... the Stardust replaces them completely as a whole unit.
To touch on the eGo-Twist portion .... this battery replaces your previous battery and as I mentioned it is compatible as well.
The following is just a pic of the Type-A and Type-B "cones"
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Randy