Well, yeah . . .
But presumably both products are using the same virus definitions.
And according to Virus Bulletin, Norton has one of the best track records for detecting viruses with 40 successes and 6 failures (8 no entries) since 1998.
Kaspersky has 40 Success / 14 Failure (0 no entries) since 1998.
A lot of people slag Norton/Symantec Antivirus, but I'm not seeing a lot of evidence from independent test sites to support that claim. In fact, I'm seeing quite the opposite. This doesn't imply Norton/Symantec Antivirus isn't a resource hog, but it's not failing tests recently that others are.
http://www.virusbtn.com/index
Virust Bulletin's testing has been around now for ahwile.
This also doesn't mean I'm going to be buying Symantec Antivirus anytime soon either. I'm just saying I'm not sure all the negativity towards the product is deserved.