You need to measure them both properly,there might some secrets in setting sus up but when it comes to fit that is very straight forward and even allowing for optical illusions the YSS looks longer to me.

Either get to long bolts in either end and measure with a vernier or a piece of steel bar that is the same size as the bolt holes and measure that.

Just as an after thought!! You sure you don't prefer it that way,easy to get clearance with something under the center stand when changing the wheel and will almost certainly have speeded up the steering.