Nope. The FX and WR share the same crank. Look it up.
It further appears the FX and WR crank and flywheel are the same. The YZ uses different part numbers.
I stand corrected. So much for information from other sources. If that is the case my FX definitely feels like it has a lighter flywheel than my '12 WR so I assume the new WR will feel the same.