What is the difference between the yellow and brown exploding barrels?

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There are two kinds of exploding barrels in A Wizard's Lizard, the normal brown ones and the jittery yellow/golden ones, as depicted in this screenshot:
I always thought the yellow ones would have a larger blast radius, but a recent test proved me wrong: The blast radius of both kinds of barrels is one space.
What's the difference, then?
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Explosive Barrels.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Karolina Grabowska, Karolina Grabowska, Ave Calvar Martinez, Ave Calvar Martinez