Also, Check out the
counter manifest thread. In particular,
post #3. It lists what the differences are between the Retail and KS edition contents. The short version is:
1x K1 (Targets Go Boom 1)
1x L1 (Targets Go Boom 2)
1x M1 (KS Exclusive Overlays 1)
1x M2 (KS Exclusive Overlays 2)
1x P1 (Vulcans & Friends 1)
1x Q1 (Vulcans & Friends 2)
You will probably be interested in the
Counter Manifest on BGG, too.