Actually, no.
WARNING: SCIENCE AHEAD
[spoiler]As caesium has a far greater atomic mass than sodium, an equivalent weight of caesium would have less atoms, as each atom weighs more. Thus, fewer atoms react, and there is a smaller explosion.[/spoiler]
Also, I'd say that that kid's karmic punishment was rather harsh. Having flaming molten sodium simultaneously melt and explode your face off is never pleasant.
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I'm talking same number of moles of each substance.