From my understanding, there was no pattern to Y61s with the big diff. Nissan used them with different engines. One might have and another might not. The H233 is a very strong diff and the front axle in the Y61 is very strong. Even though the H260 is strong, you'll lose diff clearance with the...
H260 is a much bigger diff. The ring gear on a 260 is 10.24 as opposed to 9.17 on a 233. The number is the ring gear size in millimeters. The bigger diff comes on some Nissan truck as well as the Patrol pickup and some GUs.
Liked the yellow/tan, but prefer the dark grey, to be honest. I've always dreamed of doing mine black/dark grey. A friend of mine has a patrol in that color.