Ha I was about to post a similar thing - there are colloquial differences for sure. I’ve heard bell peppers called sweet bell peppers in the Deep South. And in op’s defense, some people say bell peppers are spicy in their opinion. AND there are varieties of jalapeño that can have little to no heat in flavor so, that may not be a measure to go by. But a jalapeño does have a different flavor from a bell pepper, heat notwithstanding.

But like you said, it doesn’t matter. Just eat them because they taste good!