There're about the same size, Smith maybe a bit bigger (Barkley looked like a lhw at mw & Smith looks like a cw at smw).
smith looked seriously uncomfortable on his back foot and his jab poor. barkley decisions him id say.
I am not that impressed with what I've seen of Smith, so far. At this point, I think Barkley would probably win, by way of a 12-round drubbing (though, he might earn a late stoppage in the process).
Smith seemed good and like he might be too much for Canelo back when beat the crap out of N’JIkam. Then the Ryder fight happened and I stopped believing. So as of now, I’d back Barkley.