1969 arctic cat panther engine help

I have a 69 panther 372 jlo single with some extra engines all 372 jlos the one that was in it not sure if it was the original but the cylinder and piston look like the factory when I pulled it apart the top ring was stuck and I broke it I took one of the other engines apart and the piston and cylinder are different and the rings are good the top of the piston is grooved the skirt is different and form the pin to the top of the piston is shorter and the cylinder looks like it has bigger ports

Do I buy rings or use the other top end

The first three pics are the original the second three are the ones from the extra engine that the case is melted from a fire I cant swap the engine

Thanks for any help

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