True or Urban Legend… Mopar/Beechcraft pistons

Many (many) years ago when I was a teen some guy was telling me that the 383 Magnum engine in his 71 Road Runner had Beechcraft pistons in it. He was telling me that one of the flat/horizontally opposed six bangers in a Bonanza or T-34 used the same piston. Anyone know if this is a fact?
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