10.7.1 Build 11B2118: Universal?

Today I restored a 2011 MacBook Air from Recovery with a newly-downloaded InstallESD; I also captured the fresh InstallESD on a flash drive. I copied InstallESD.dmg with SIU and created a NetInstall set on my lab, and for shits 'n gigs, wanted to see if it'd work on a test partition of my Sandy Bridge i7 MacBook Pro... so onto a test partition it went. Build is 11B2118, and all works perfectly--FireWire's detected, graphics work just fine... my SuperDrive can't be tested unfortunately as there's another HDD there. I'm creating an InstaDMG source with a 10.7.1 Vanilla catalog (simply removing the 10.7.1 update) and will share my findings... but as of now, it seems 11B2118 is perhaps a universal build... (for now, of course). This may be old news so I'd love to hear if anyone has any other findings. Thanks!