The 3TN84 from a 955 should be close, although it's not identical. (Water pump, cooling fan, oil cooler, etc). It's also indirect injection as opposed to the direct injection of the 3TN75.
Mechanos brought up the fuel tank location. This may be a concern, you'll have to do more re-plumbing/fabrication if your 855 is an earlier model with the fuel tank in front of the radiator. All 955's had the tank between the operators station and engine.
I've never heard of the 3TNE88.
Let us know how it works out.