Its the same physical size and that's what counts IMO.The 562xp is not the same size saw as the ms400. There is almost 8 cc's difference between the two saws. The 562 is 59.8 and the ms400 is 66.9 cc's. In my opinion the ms400 is a different class and it should be a stronger saw and the price reflects that. Both are great saws but the power to weight the Stihl is going to win and should have better performance in larger stuff. The ms362 is more apples to apples to the 562xp.
The 362 is a turd and should be discontinued.