Yes they got killed in England
Hamlet changes the letter going to the King of England to kill him when he gets there to say to kill the people who give you this letter,which were Rosencrantz and Guildenstern. So they were killed instead.
Claudius sent with Rosencrantz and Guildenstern an order to the king of England to have Hamlet put to death. I assume this is the "murderous commission" you are talking about. Hamlet finds it and substitutes another which is worded just the same, except it is Rosencrantz and Guildenstern who are to be killed, not Hamlet.
Rosencrantz and Guildenstern - both who end up dead.
hamlet killed king Claudius, Polonius, and laertes. (he technically killed rosencrantz & guildenstern because of a letter telling the king of England to kill them)
In England where they have been sent to accompany Hamlet to his death.
Rosencrantz and Guildenstern ultimately meet their demise when they are sent to England with a letter ordering the execution of Hamlet. Unbeknownst to them, Hamlet discovers this plot and alters the letter, leading to the execution of Rosencrantz and Guildenstern instead. Their fate underscores the themes of betrayal and the tragic consequences of manipulation in Shakespeare's play.
Guildenstern and Rosencrantz both die by the hand of England due to the mix up of letters by Hamlet. Ironically Hamlet was suppose to be behead; however, because Guildenstern and Rosencrantz bring the letters written by Claudius to England they ended up giving the letters rewritten by hamlet that lead to their beheadenment.
Claudius and Gertrude set Rosencrantz and Guildenstern to spy on Hamlet to discover the cause of his apparent madness
Polonius, Laertes, Claudius, Rosencrantz, Guildenstern and indirectly Queen Gertrude and Ophelia.
Rosencrantz and Guildenstern are Hamlet's childhood friends. Claudius sends them to spy on Hamlet.
Hamlet's uncle was sending Hamlet to England to be killed and Rosencrantz and Guildenstern were taking him there, but on the ship, Hamlet switched the orders with orders to kill them instead and got off the ship. They died in England.
Rosenkrantz and Guildenstern. Personal note: I have met the actor who played one of these roles in the original stage production.