Actually, there is a slight difference with the calendar, but it's because BB OS 4.3 is on the Pearl versus 4.2 on the 8830. The 4.3 calendar allows you to color-code your appointments and pin them to the mail account from which the invite was received. By default, all appointments are attached to your default mail account. This was very annoying and in certain cases (PocketDay, for example) calendar events not associated with the default mail account never showed up in PocketDay summaries. Plus there is no way to move the event from one mail account association to another once stored.

Not a big deal if you only have one email account going to your device.