Apple has updated their build numbers list to indicate which build of 10.6.3
is shipped with the new MacBook Pro's.
http://support.apple.com/kb/ht1159

Based on the numbers, if you build a new 10.6.3 image off of a mid 2010
13-inch MacBook Pro, it will probably work with all previous models that
support 10.6.x. (I do not have a new MBP with Core i5 or i7 to verify.)

The 13-inch ships with 10.6.3 build 10D2125. That is a higher build number
than the 15-inch MBP mid 2010 which ships with 10.6.3 10D2063a.

Time to build a new Netboot image and a new 10.6.3 OS package.

Jason