same width, 2.5 wide
the YJs have a centered pin, the Waggys are offset with the short side being the same length as a YJ and the long side being 2 inches longer.
stock YJ springs will net about 4 inches of lift. stock Waggy springs will net about 6 inches of lift. this is of course dependent on things like where you mount the spring and shackle, what engine you have, if you have a heavy winch and bumper, etc. but a good base-line.
for junkyard springs I would far prefer the Waggy, the stock YJs are way too soft. if you're looking at aftermarket lift springs there are far more offerings for YJs. my 3.5" YJ springs from BDS give about 7", are double military wrapped, flex great, were pretty cheap, and have a lifetime no question warranty. I highly recommend BDS.