All parts of all Sikorsky model series (type being equal) are interchangeable with others of the same series. Box dimension parts are +/- .0002" of an inch, that's Tail and main rotor parts mostly, the rest are usually +/- .0025" of an inch.
Just think about the ingeniuity and care that went into this and later into the whole Apollo program. These guys were top league and proved that sky was (not) the limit.