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Is there any reason to run one or the other? Rulewise I'm still fine to use the empire cannon right?

Empire cannon
-40" range
-6+ on crew
-grapeshot

Cannon
-32" range
-5+ on crew
-reroll damage

Is there anything else I'm missing? Any big reason to run the standard cannon over the empire one? I'm mainly looking at using the empire rules because that's the model I own.