Year-over-year changes?

I'm confused about the difference between the "rear storage compartment" and the bumper storage.

I have the "rear storage compartment" that is big enough to hold my bbq, 3 white water hoses, fire pit, folding garbage cans and some other stuff. It can only be accessed when the rear shell is open and the rear bed is extended.

In the bumper is my sewage supplies, it has a pop off cover across the entire width. There are three sections.

I have never seen the old style so I do not know what it looks like. In October we have a west coast rally. Maybe one of the 30+ TMs will be the older style and I'll get to see one.