Actually, there are two atomizer-specific cartridges: one for the "original" DSE 901, and one for the the 4075, although the suppliers never bother explaining that. The 901 cartridge is shorter, one piece, totally black and meets the higher bridge, while the 4075 cart is slightly longer, has a brown extension, and meets the lower bridge. You can also tell the difference in the thickness of the mouthpiece -- look at the carts on Totally Wicked's website -- those are for the 4075 (the atomizers they sell are 4075's). The mouthpiece is slightly thicker, and has a hole instead of the slit of the original 901 mouthpiece.
All I can tell you for sure, is that if you buy carts from TW, or Heaven Gifts/Ruyan, for the 901/4075, you are buying 4075 carts. If you buy carts from Best
E-Cig or
AltSmoke, you are buying the shorter carts for the original 901.
I have the "original" 901 that I bought from AltSmoke -- he sells the shorter 901 carts to match, as does Best E-Cig.
I also have a ScrewDriver, which comes with the the (recommended) 4075 atomizer and carts and I buy carts for that from either TW or Ruyan/Heaven Gifts, since Trog doesn't sell parts.
It's just a mm or two difference -- but it does make a difference.
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