Known issues when installing official google ICS on Galaxy s2
Unfortunately, that's not how it works :/

Though we would all love the official ICS versions rolled out to the Nexus S and Galaxy Nexus devices, they are designed specifically for the hardware of those phones; thus is the nature of Android.

So, if you want something similar, the only way you will be able to get it is a 3rd party ROM. The only official OS versions for each phone are the ones rolled out by each provider, in your case, Samsung.