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I believe Dragon 2 has the same number of 400N Draco thrusters that Dragon 1 has, which is 18, but I have not seen any confirmation of this.

Dragon 1 appears to have them arranged in 2 sets of 4, and 2 sets of 5, as seen in this photo:

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Yet Dragon 2's layout is a bit different, if everything is symmetrical, it appears to have 4 sets of 3, and the 4 lone thrusters on the inside of the SuperDraco mold lines:

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This produces a sum total of 16 Dracos. So, what's right? Additionally, if there is a difference, why?

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Going through my photos of the Dragon 2s we've seen so far (initial presentations - I've got photos from all angles of that one, and the pad abort test) you're right: the Dragon 2 has 16 Dracos.

According to a thread on Reddit, Dragon 1 had two extra thrusters pointing 'up' because the 'up' thrusters are used for the reentry burn and SpaceX wanted more redundancy for those.
Presumably on Dragon 2, with 8 SuperDracos, redundancy for the reentry burn is taken care of.
All engines in one thruster group are fed from one propellant tank.

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