I tracked footage in Mocha Pro standalone with two shape splines and exported the position/scale/rotation data and pasted on to a solid in AE. The frame rate matches in my composition and in Interpret Footage-Main in AE. I set the timeline to the start before I pasted. The project dimensions also match the footage in Mocha. But there is some slight drift as compared to the Surface in Mocha Pro. What could be wrong?
Update: I was trying to use a screen insert so perhaps the After Effects Transform Data [position, scale and rotation] (*.txt) was the wrong export option for this. Perhaps I shoud have used corner pin export?