Is there a technical difference between 210-APWU/5Y and 210-APWU? Maybe different matrix or something? I know that 210-APWU/5Y has longer warranty, but I'm interested if there is a difference "inside" the monitor.
Those are just different sales numbers denoting warranty difference. You can see here that there is only one $199.99 P2419H. Note, do not confuse it with the $234.99 P2419HC.