Additional questions that I think are relevant to your query:
1. Would the 3D screen replacement include the built-in IR emitter?
2. Are the G74SX variants all have the same motherboard specifications (2D/3D compatible)?
It would be really helpful if the @ASUS guys could confirm or negate these,
considering that this question isn't the first time asked in the Forum..
ASUS G74SX-3DE