The CIH Farmall 35A is equal to the NH Workmaster 35C. The CIH Farmall 40A is equal to the NH Workmaster 40C.
CIH has the Farmall 40A part manual on their website, but none of the other manuals for CIH or NH are listed.
I checked the front axle, rear axle, PTO, and HST. None of the parts I checked are used on any other model.
The MT20126719 cylinder had is used on Farmall 35A Sereis 2, Farmall 40C, Farmall 45C, Farmall 50, Farmall 55C; New Holland: Boomer 35, Boomer 40, Boomer 45, Boomer 50, Workmaster 35, Wormaster 40. These all use LS L3C19-T engines I believe. So it has an LS engine.
Front axle parts 87277318, 87277838, 87277837 all reference TRG400.
Front, Differential | Case IH | MyCNH US Store
Looking at TRG400 online I found a listing for and axle shaft for TRG400 axles part # 40306912 and it fits LS P7010, P7020, P7030, P7040 tractors. So the front axle appears to be LS.
LS Tractor F/AXLE Shaft TRG400 PART# 40306912 FITS: P7010, P7020, P7030, P7040
www.diamondrequipment.com
This does not answer who makes the tractor and where. It could be like JD who imports lots of parts from Yanmar and then builds the rest of the tractor, or it could be an LS tractor made in South Korea. Should be interesting.