It uses the same coils as the Normal NRG tank. I haven't used the mini so can't really Comment on that.
But the coils in the Nrg tank gives awesome flavour, especially the ceramic coil.(25w - 35w) the GT4 coil is also great for Flavour, But I find the GT8 alright for flavour on the first few tanks.. Also the Smok Baby beast Coils fit in the Tanks aswell.
I can’t seem to find the original NRG tank (not the mini) and I’ve looked at a few different vendor websites. I may be looking in the wrong places, but they only seem to sell it along with the Vaporesso mod as a kit. Definitely keeping an eye on the NRG mini now.