Admittedly, trying to compare "sizes" is a little bit arbitrary. You can define size by dimensions, or weight. To me, comparing by dimensions makes the most sense. As a first pass, I look at rear tire size. In R4's, a rear tire of 24, I consider "large", whereas a rear tire of 19.5 or 20, I consider "medium".
Using this criterion, the
L3560 and XR4140 are both "large" while the XR3140 and T474 are "med". Next I look at length and wheelbase.
The
L3560 is 115 in (w/o 3PH), and the XR4140 is 133 (w/ 3PH). I'm guessing the 3PH adds 12 inches or so, so I think that's close. The wheelbases are 71.1 and 73.2, respectively. So, yes, the XR4140 is slightly larger.
The XR3140 and T474 have an overall length (W 3PH) of 124.3 and 131 respectively, and a wheelbase of 65.7 and 69.7, respectively.
So, the T474 probably compares the closest to the
L3560 in dimension, with the XR3140 being a little smaller, and the XR4140 being a little larger.
Even so, the obviously smaller LS outlifts the Kubota by almost 20%.