The main difference between the 10" models is that one works with the stylus, and the other doesn’t.
All the tech that goes into making the display stylus-compatible is quite complicated, so it makes some sense that there’s a price difference / that they leave those out for the budget model.
The 13" model is basically the same as the 10" “pro” model, except it came out a few months earlier, before some of the new features (a display with more colorful primaries, and better cameras). At the point that new “pro” models come out (later this year sometime), the next version of the 13" iPad will pick up those features.
All the tech that goes into making the display stylus-compatible is quite complicated, so it makes some sense that there’s a price difference / that they leave those out for the budget model.
The 13" model is basically the same as the 10" “pro” model, except it came out a few months earlier, before some of the new features (a display with more colorful primaries, and better cameras). At the point that new “pro” models come out (later this year sometime), the next version of the 13" iPad will pick up those features.