8CR13mov is a bit better than aus8. AUS-8 is normally softer. My EDC knife is AUS-8, just cause the design fits my hand well and it does what I need it to do.
I wouldn't worry too much. If you like the 8CR13mov then get it. It's a descent steel.
http://www.spyderco.com/edge-u-cation/steelchart1.php This is a link to Spyderco's education website.
I use their steel chart a lot. You'll be able to compare different steels here.