The Neck will fit - but the Mustang Bridge saddles are going to be @ a 7 1/4 radius -- you would need to either replace the bridge w/ a 9.5 radius Mustang bridge, replace w/ an Adjustable bridge piece (TOM or Jaguar), or just adapt to the slight diff between the curve on the bridge and the fretboard.
Squier Vintage Modified and Classic Vibe Mustangs and Jags are 9.5 Radius -- a Squier VM Mustang bridge might be just what you need for that modern 9.5 radius neck