I looked up the parts last night. There are actual part number differences in the fuel pump itself. Additionally, the stop had a different number.
There is almost no difference in PTO hp (.2 difference) at 540 rpm. If you were to run the pto a little faster, the 3000 rpm motors would make a noticeable difference, but your pto would be spinning at 570 or so (which would probably be fine).
As for engine hp, the 3000 rpm motors net 2.3 more at full rpm. I feel that is considerable.
My opinion is that hydraulic differences are likely negligible, considering the relief valve on both setups are set to 1920psi.
Seat Is a tangible upgrade, as is the guards in the turn signals. I personally completely removed mine today (it spends no time outside my 5 acres). At some point I may move them to the inside of the ROPS, and even with guards, I would bend them up/break them in my tight trails.