The crankshafts are likely to be interchangeable, and so are the complete engines, which have build dates only 2 years apart, but the green one is a later model as well as having Magnetron electronic ignition. Since without a crankshaft the green engine would be scrap anyway, it seems to come down to a case of whether you are trying to restore your mower (best done by keeping the original base engine) or get it looking decent and running well (best done by using the green engine). Either way, you'd mix and match parts as necessary so long as they were not model-specific.
