I don't know how close to the Kubota size you need but the
Kioti DK35SE cab is 8 inches wider (61.6" vs. 53.7") and it's tough to say how much longer since Kioti gives the length WITH the 3pt hitch (129.1") and Kubota list the length WITHOUT the 3pt hitch (103.9"). The wheelbase is 4" longer (69.5" vs 65.6") though so overall it's probably longer. The Kioti is 95.3" to the top of the cab and the Kubota does not list height with a cab. The Kioti is significantly heavier at 4,133lbs and the Kubota is 2271lbs "with ROPS", I don't believe that includes the cab weight.
The slightly larger frame of the Kioti also comes with:
More horsepower
38HP/26PTO HP vs. 30HP/23PTO HP
Larger engine
111.43 cu.in (1,826cc) vs. 91.5 cu.in. (1,498cc)
MUCH stronger hydraulics
15.2 gpm vs. 9.1 gpm
MUCH stronger 3pt hitch
2,383lbs vs. 1,676lbs
Slightly stronger loader
1155lbs vs. 1091lbs
Higher loader lift
92.5" vs. 84.6"
Longer warranty
4 yr vs 2 yr warranty
Plus really nice standard features like an independent push button PTO, tilt steering, electric over hydraulic push button 4wd, rear 3pt lift control so you can lift the arms from the rear while attaching something, suspension seat, separate HST pedals instead of the single rocker pedal, and differential lock.
I would be willing to bet it will be cheaper by a couple of grand as well. Kioti makes great tractors and proves that with a solid warranty and very comparable specs. I have had my 2006 model Kioti for 4 years with over 400 hard hours on it and couldn't be happier. I would love a factory cab vs. my cheap aftermarket cab though. Both the Kioti DK35SE and the Kubota B3030 have 3-range HST's which I would love to have vs. my 2-range HST as well. Happy shopping!