The answer to this question depends largely on the specific parts being referred to. In some cases, New Holland parts may be compatible with Massey Ferguson parts, in other cases they may not. New Holland and Massey Ferguson are two distinct tractor brands, and while they may have some compatibility issues, most parts are not interchangeable between the two brands. Compatibility will vary depending on the exact part and model of tractor. Generally speaking, as a rule of thumb, the only way to know for sure whether a particular part will fit both brands is to compare the parts for exact dimensions and make sure that the parts are compatible.