No, it's actually not the same as the adapter.

The adapter you posted has 25mm rise if used with spacers it says.
Then, you would add the extender, which is listed as being able to add an extra 70mm of height.
That combination looks to add about 95mm total.

What I showed you has an overall height of 180mm, 110mm of that is above the minimum insertion line, but with a 40mm clamp height it offers 70mm of extra height maybe?

Your combination raises the handlebars 95mm and the VO piece raises the handlebars 70mm. They're going to be within 25mm of each other. Depending on what stem you're using you could get that 25mm back easily. On the plus side of the VO piece is that it's cheaper than the combination and in my opinion looks better.

Have you measured your current quill stem setup and figured out just how much rise and extension you need to hit your target handlebar position?

There is also quill stems like this that have removeable faceplates for easy handlebar changes if that's why you're going threadless.
http://www.ebay.com/itm/Sunlite-Stem...0AAMXQrhdTTC0C
There are also adapters that are MUCH longer than that Profile Design piece so you may not need an extender. I think this one is about 85mm of rise?
http://www.ebay.com/itm/STEM-RISER-S...sAAOSwEeFVJ33O

Measure twice, buy once =)