They are the same motors, the crank might be a different size but highly doubt it.
He dont have a engine in his 1886 thats why he needs one.What is wrong with your motor now? This should fit right in, if the manifold is backwards then you can always make a heat shield for your foot, because you will never be able to take the manifold off without snapping the bolts. You always have your motor if you need to switch parts like the carb, etc.