Not always. There's no guarantee that the power pedestal is wired to provide the full 30 amps AND not OR 20 amps. Same thing with a 50, and a 20 or 30.
There might be a way to measure and test to ensure this but I'm not familiar with it.
Not sure fireworks might occur, but I'd be more concerned with brownouts (not enough amps, but enough for some appliances to attempt to run). Brownouts are death to things with a motor like an A/C because they do not do well when they run at too low of a voltage. This causes the amps to rise to make up for it and then this could fry a motor.
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