Maul, but if Batman V1 was the first, doesn't that mean that BR joker would be like the second or such? And regarding the other question, is the narrow body the same height as the standard one?
No, originally the narrow shoulders was made only for Batman, with no intent to use it on other figures. Fans spoke up more and more after seeing photos of the improvement for the Batman figure about how we'd like to see it used for other figures and how the standard TT is too wide. It was months before we saw anything about it, there was hint that DX Joker uses it, probably a safe bet, and they're selling nude narrow TT's. So far, Batman's the only in hand figure with the narrow TT in use that I'm aware of, with Michael Jackson being on the slim body. I don't know about James Dean.
BR Joker and Two-Face both used standard TT bodies. The clothes of BR will fit on the narrow body, but how they'll look is hard to say, Two-Face we've seen a swap and it looks better, but I always felt that figure looked too broad shouldered, with the size of Joker's head after hair and all, I think the BR looks just fine on the standard.