Can you identify these pistons?

Correct his are cast. That’s the issue with the interchanges from one brand to another. They were forged from Dodge but once you started getting into after market different companies produced parts that would “work” but were cheaper, to make them appealing to peoples wallets, that’s how places like JC Whitney were able to sell cheaper parts. They fit but the durability wasn’t there, much like stuff today. In our old auto parts store we always kept the higher end parts.