AG4Life - 4:06 am on Mar 4, 2010 (gmt 0)
Maybe with really small sites up to 1000 URLs it's the same for "site:www.example.*" but when you do a query on WebmasterWorld URLs and different larger sites you will see it is a completely different number.
I tried and got the same number of results back for a site that used to have 70,000+ main+supp pages, and 25,000 non-supp. Same with my website of 15,000+ pages.
But as I type, it's gone, and it's back to being different results for "site:example.com" and "site:example.com/*"