The hydro pumps are the same on all the 20 series Bs.
Kubota makes incremental, fractional, minutia differentiating steps in its 80 models of tractors. It blows your mind that they need 80 models!!!
If you need a heavier tractor, better 3 pt with depth control, larger frame and other deluxe features, then quickly move up to the 30 series Bs. They are sweet, but the prices go up quickly commensurate with those deluxe features.
The real difference in the various 20 series, beside the loader, is hp. That only really comes into play if you run a
chipper, but most importantly.... a SNOW BLOWER. If you blow snow, you absolutely, positively need the increased hp.
Otherwise, the
B2320/2620 are great little, albeit, "standard" tractors.
Mine fits my needs like a glove. Just gotta add more weight, which is easier to do than trying to deduct weight.