Rolled oats are whole oats, they are just processed differently.
Flattened.

I'm not sure where you got your GI info.  I checked
http://www.glycemicindex.com/ and it lists the following:

Porridge made from steel-cut oats, cooked in water      52     
Porridge made from raw rolled oats              58*
Quick Oats, instant porridge                  65

* The rolled oat GI ranges from 58 to 75 in their database.  This isn't
all that surprising since the GI would be related to the thickness of
the rolled oats being tested.

"There's good reason to believe too that steel-cut oats are lower
glycemic than rolled oats because of the larger particle size."

http://www.mendosa.com/low_carb_low_gi_foods.htm

Here's another site with a lot of oat info:
http://www.karenskitchen.com/a/recipe_oat.htm

Those values are for cooked porridge.  The "quick oats" will absorb more water,
maybe a lot more water depending on how they are prepared,  therefore their GL
will be lower because of their water content.

You need to compare them by dry weight.  

Ora