The fact that they are, according to Blizzard, “two separate games entirely” means that a system that is used in retail will not necessarily be implemented in Classic in the same manner it functions in retail, though.
Blizzard could implement the right click report in Classic without tying it to a player imposed punishment system, they could retain the player imposed punishment but require more reports to be received before that player imposed punishment is triggered or they could implement the right click report exactly as it is in BFA.