Hi,
The Pickit2 User guide V2.61 2008 shows a very clear circuit diagrams of the Red button version.
I'm not aware of any changes to the circuit after that, certainly none that make any operational difference.
I believe you can tell its the Red button version by the additional 4k7 resisitors on the PGD and PDC outputs.
The Red button started production in late 2006.
The Sure unit seems to have a very clear schematic on their site dated Dec 2007 and they have even outlined those resistors in yellow, probably to highlight this very point.
Just quicky comparing both diagrams there seems little difference between the two circuits from an operational view.
The fact that the Sure unit has a Black button is I think misleading you, it uses the latest Pk2 V2.61 program so feel sure it works as a RED button does.
Just wait till you get it and check out all this features, think you will find they are all there.
A dab of paint will easily upgrade it to the RED button !