I have been through this a few times, and it seems like a very fuzzy science.
The tutorial actually mentions this if I remember correctly.
You might want to take a look at the MoCon scripts for Maya and AE at:
https://www.3dmation.com/
These cost $20 but are not very well documemted (at least me, a novice Maya user)
I did however get accurate Maya camera matching in AE after adjusting the Zoom paramater of the camera in AE.
good luck!