Google's Reported Page Counts -- for different queries

[sviba]

why the google SE makes a different results in same DC, while i am using the following queries

site:yp.sample.com = 319,000
allinurl:yp.sample.com site:yp.sample.com = 139,000

But it returns same results while i am using the following queries

site:sample.com
allinurl:sample.com site:sample.com

Also,

site:yp.sample.com = 323,000
allinurl:yp.sample site:yp.sample.com = 278,000

Please explain how the G shows those results