The second flavor, Chocolate Mocha Latte, is a little more intense: It has a double-espresso filling and a cream-flavored icing base with a swirl of coffee flavor on top. It's super-chocolaty. Like Augustus Gloop-falling-into-a-river-of-chocolate chocolaty. Again, this is not a bad thing.
You can see for yourself, as this December the (limited time only!) the Dunkin' Donuts Pop-Tarts will be available everywhere you normally pick up Pop-Tarts. Which -- unless you have an underground Pop-Tart dealer like I do -- probably means your local supermarket.