Can I use the Paris museum pass for a timed entry ticket to Versaille?
No. You have to buy a timed entry ticket or use your pass by just standing in the security line. If you plan to use the Museum Pass for Versailles either get there an hour before the chateau opens or book the King's Apartment Tour which allows you to buypass that line.
As mentioned, the museum pass doesn't allow timed entry. However, we arrived in time to get in line 30mins prior to chateau opening. Weren't too many people in front of us in line and didn't seem crowed to us as we toured the chateau. Also, if the fountains are running you will have to purchase an additional ticket to enter. However, the estate of Trianon is included with the pass.