There have been several books written by "Model T" Cognoscenti just on the differences between cars. With 15 Million made there are thousands of Changes in the the years from 1908-1927. Many of those books are quite large.
On the subject of Model A Fords and Deuces I'd be willing to bet there has been just as much written. I'm a Model T fanatic myself, so Model A's are not really in my wheelhouse, but you could study either car for the rest of your life, and still run across new & surprising things. Even now, over 100 years after the T was built, there are still new discoveries made about features and manufacturing anomalies that turn up, in contravention of what "Everybody Knows".
So Take heart. Even the so-called "Experts" are proven wrong about things that "Everybody" knows to be true.
Keep learning and have fun. Only Sweat the Details when they are important to YOU.