The enterprise tier is the business version of an AI tool. The important difference is not features but data handling: on business and enterprise plans, your inputs are typically not used to train the model by default, and use sits under a formal data agreement. On many consumer plans, the default leans the other way.
That is why the real privacy line at work is personal versus business, not free versus paid. A paid personal plan is not the same as a business agreement. Check which tier your organisation is on before sharing anything sensitive.