No.. Never flash an update that isn't specifically designed for your EXACT model of phone. The software or " OS " itself may work but there is more important things like the radio's and other things that can brick that device in a heartbeat if its not designed for your model/carrier of phone.
Keep in mind that Samsung released a lot of different variations of the Galaxy II to a myriad of carriers worldwide. The Epic 4g Touch happens to be the one on the Sprint Network.