best bet- go to your local chevy dealer and look at the HHR's. Both colors are currently options on that car. My friend owns IBM and its very dark. ABM looks a lot lighter and more like the one pictured on the chevy site. I did the same when choosing my color. I saw the a vette there in Cyber Gray metallic and fell in love...
2010 Camaro Cyber Gray 2SS 6 speed man
Black Leather Interior, polished wheels
2002 Silverado 1500