T5/Farmall U is heavier than a T5000/JXU, more like a T6010 etc
There are two ranges of T4/Farmall C, there was a range of T4 that went up to a T4.115, which was the equivalent of a T5070, a lighter backend than a T5.115. This range of T4 is now known as the T5 utility range.
The other T4 range goes to 75hp and is a smaller, lighter tractor, still Italian built to best of my knowledge.
The TD5 and Farmall A range are the hideous Turkish built models.
The Farmall U Pro/Luxxum doesn't have a new holland equivalent, they are a follow on of the steyr design (zf back end), like wise there isnt a case version of the T5 Electro Command