This has been the source of confusion with NH since Fiat showed up. Traditionally, North American (NA) Ford used M2xxxx oils, that was their spec numbers, be it a tractor, auto or truck. European Fords used other numbering. Ambra is Fiat's oil. That's why they use Ambra 134. They combined the Fiat/Ford names.
When the Fiat based machines showed up ( TN, TL, LB, LW), the owners manuals were calling for 410B oil, the brake oil had different numbers, the only ones that could be figured out was the engine oils. Now that Case/IH is in the mix, and more cross branding, there's more confusion. NH has a chart showing the NH/Ford, Fiat, Case/IH, Sae and Mil specs, along with current part numbers.
Long story short, NH410B is multi G 134 which is M2C 134D.
The cold weather substitute for 134 is F200.