Being currently up to my eyeballs in a Mahindra purchase, I'll share some related info I've learned.
3510 -> 4110 :
3cyl -> 4cyl
35hp -> 41hp
28hp PTO -> 33hp PTO
smaller back wheels -> larger back wheels
small front wheels -> much larger front wheels
In speaking with my dealer, an 84" finish mower is okay down to about 27hp PTO. (Not exactly your application, but should be able to correlate).
I opted for 3510, reasoning the PTO hp was okay for my most demanding implement, and the remaining hp was probably used to drive the much larger front wheels in the 4110.
I've looked at both (read: climbed all over, have brochures,etc). Same identical tractor except for engine and wheels, as far as I can tell. Dealer agrees.
CAUTION: 3510HST ("Hydrostatic 3510") is *NOT* a 3510 with hydro drive. It is more of a 2810 with a larger engine. about 2 feet shorter, around 800 or so pounds lighter, uses smaller loader, about 900lbs less lift capacity, but adds mid-mount mower up to 72".
I almost made the 3510HST mistake, figuring $1k was good price to up to hydro, but luckily found out about the big downgrade in tractor.
I also opted for R4 industrial tires. Not as turf damaging as Ag, more aggressive than turf. We run this same tread on our Case 580K backhoe with excellent results. Expecting same performance on this smaller CUT.
Hope some of this helps. Best advise is to READ, READ, climb all over, talk with dealer.
Good luck.