The first medal (or, the prototype) is very interesting to me. Hunyadi, are you sure that it is the prototipe exactly of the Hero of the HUPR, not of the Hero of the Socialist Labor, or some kind of after-Rákosi version of this order? Because the ribbon and design are the same, only Rákosi symbol is replaced with the Kádár coat of arms, and that was usual for many hungarian orders and medals after Rákosi's fall.
Please, don't think that I say you are 100% wrong, I only guess - indeed, for me it is the first time I see this medal, and the literature I have doesn't describe this type, or prototype.