I am aware that the 6.4 was international, ford decided to not use any of the international emmissions parts though, and basically retrofitted thier own designs, which sucked....LOL
As for dot numbers, only reason i have a diesel is for my 5th wheel, and as far as the tune goes, it is by no means a "hot" tune, it is simply a towing tune, with the emmissions stuff deleted, and the fuel map compensated for the larger injectors, the entire engine has been gone thru, and given a clean bill of health, fresh studs and gaskets, and all pistons inspected for any signs of cracking, which as i understand on the 6.4 was usually due to regen, which just dumped fuel in cyl 7 and 8 to boost egts to burn out the dpf due to the lack of any aftertreatment (def fluid). Even when pulling a 10k# 5th wheel camper uphill, the boost levels stay right around 38psi under full huff, which is not really in the realm of destructo land, unless you are there ALL the time... 90% of the time i dont even see over 20psi...