I don't know. They will tell you when you try to check out.
Yeah, I have both and they are exactly the same color/fabric.
I'm 6'3" and went for XL in the Flash Dual Fullzip in dark grey. Fits nice and snug (but not too snug and great length) and with a couple of washes has loosened up nicely. Now if only my TOJ would arrive soon.
I'm hoping Black Friday / Christmas, John Elliot & Co will have a sale, like 15-20% off entire store :)
this'll fit well