There may be other differences as well.. Though I have not investigated I do know that usually I use a 30 amp cord on 30 amp sites because my primary 30 amp cord is a super-flex, these are more expensive, (I also have a 30 amp extension cord which is standard and way harder to wrangle left over from my 30 amp trailer days)
With 50 alas I do not have a superflex. (would like one)
Another thing: When designing things like power supplies I like to "Over build" that is the supply designed to power my 2-way radio (requirements 3 amps at 13.6 volts) could actually deliver close to 10 if I bypassed the circuit breaker.
Some cord makers may use a larger (or smaller) wire, still within the code, but where as the smaller wires is "Just" the larger one is "Well" within the code.
Example: When I made a custom cable for powering the house off the motor home should the power company fail...... The cord was for 30 amps, but the wire rating was for 50 amps.
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Home is where I park it!
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