PWM- Here's what I know about those 2 gloves.
All of the pudge gloves are 32.5 inch models. You can get both of the A2000 and the A2403 in other sizes, up to 34 inches.
The real difference I have seen between the two is that the A2000, which cost $100 more than the A2403, seems to be made with a little bit better leather. So it might last a little longer and break in easier. Whether or not that is worth the $100 is a personal choice.
Hope this helps!
Coach Fletcher