No, they are not different. An explosion occurs when a combustible ignites and can't vent pressure. It could be resistance in free air because the fuel ignites so fast, or it could be because it's contained mechanically. I had some small black powder fireworks that went pop on their own, but when put in some kind of container like a marker or when wrapped in duct tape, they became loud booms. Take the powder out and it just burns slowly (compared to the explosion). Containment raises the pressure, which raises the heat, which increases the rate of reaction. It's all resistance to expansion.
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