difference between rookie and veteran difficulty

first year i play and sometimes i play in rookie for be sure to win ( in conquest for making more fast) and i see no difference whit veteran difficulty let me explain
1.the cpu pitcher pitch the same amount of balle or strike in easy or veteran
2.the cpu batter can hit homer whit a swing early on a ball in easy or veteran
3.i make 90% swing good and got out every time ( i play whit analog ) in easy or veteran
4.the number of error is almost the same

Anyone can explain me the difference ? or what the point to do 2 same difficulty ?

Pitches on Veteran are faster than on Rookie

u sure ? the pitcher cant throw over the speed he have in the stats let me explain if a pitcher throw a fastball between 92-96mph in easy
in veteran he throw the same fastball he cannot go over ??

when he says pitch speeds its not the mph he refers to, its the visual speed you see, the time to the plate.

The difference is pitch speeds. pci size not just for you but the cpu too.cpu is the reverse difficulty in hitting ,if you are rookie they will have legend pci size, vet is hof for cpu etc.