1Z0-805 compared to 1Z0-804

[TwistedLizard]

Are the 270 questions in your 1Z0-805 product a subset of the 600 questions in your 1Z0-804 product?

It occurs to me that should I decide to prepare for 1Z0-805, if the first is a subset of the second, I might as well use your 804 product to brush up generally on areas where I remain weak, the specific 805 areas being covered in the process.

Or maybe even the style of question in the upgrade exam is different?