You were arrested and charged with obstructing justice got sentenced did your time for that charge then get arrested again and charged with identity thief and forgery but its for the same crime?
So what's your question?? My answer to your "possible" question is yes, this is legal. You are not being charged for the same thing twice... there is no double jeopardy here. They are prosecuting you on different charges, even if they were for the same crime. Most courts go for the worst offense with a greater punishment first, then charge you with the lessers once that's done.