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Probably has nothing to do with the casting plug, these are casting plugs, they are necessary for the casting process, the manufacturer never intended them to be used to protect the block from freezing but I suppose one day a casting plug was knocked out by the water freezing in an engine block...

That may be but you can simply look at the "factory" ones and the Chicom repops and the difference is obvious, GM has standards for anything that gets their name printed on it. The "factory" ones have heat/chafe protection for one thing, they use heavier wire and wire insulation for another.

Both plugs look correct, I do not see the 6.2/6.5L listed on the one with the heater so that heater itself may not fit your block. BUT the one with the heater has a "factory" plug and cord and the other looks aftermarket (read cheap)

It would be hard to argue that it is not easier on the engine to have it warmed up when starting.

It does look like a "standard" (pre 2000) GM plug, the longest pin will be ground...