Why do explosive rockets claim to do less damage?

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According to the in-game stats and all the wikis I've found, the two types of rockets are:
Rocket
Damage: 60 ExplosionExplosive rocket
Damage: 40 Explosion
Why would I want to research and craft explosive rockets, if they do less damage? It sounds like perhaps explosive rockets have a bigger blast radius, but nobody's actually said that.
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Model Rockets with Explosive Warheads: Part 2
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