Actually I got mine first as a Father's Day gift from them. When they came home over July 4th and saw it personally they were chomping at the bit for their own, so I took them to the same guy who did mine.
They opted to go without color so they were similar, but not exactly the same. They really liked the message about being brothers forever. One of them said he would get color added when he made NCO (only one promotion away for him now)!
I could never tell them apart before, and now they have the same tattoo!