Up to and included 2017 the 5 cents coin has the original design with the KM#742, but in 2018 the design has changed as you can see above, but since KM doesn't attribute KM# any longer, Numista is stuck. I suggest to use the original KM# and then applying the rules for small design changes to create the NC#742.1 (NC = Numista Coin #) for the new coin.
What do you think, should we take the numbering into our own hands, or just let everything be as is?