Again - Any Pins, it has nothing to do with timers.
In the background, the servo library is using a timer to tell it when to toggle the servo pins, the actual toggling is done in software and is not connected to timer pins in anyway whatsoever, so just choose which pins you want - any of them - and crack on.
There is a simplified overview of what the library does to manage a servo on any pin here -
Duane B