The Flying King....
He needs to maintain his skills/lincence by clocking hours in the same aircraft as the licence is for, obviously.
The government's airplane is (was) a Fokker 70, the PH-KBX (it was recently sold), and the older KLM Cityhopper planes were also Fokker 70s. These are now replaced by Embraers. I'm not sure if you can fly these Embraers with the Fokker licence, but as it happens, WAX decided some time ago he wanted bigger, better, cooler, faster, and started working on his 737 licence. Of course KLM is happy to provide the good lad with the opportunity to clock his practice hours + maintenance hours.
How big a coincidence then, that the government (after a looooong process, caused by the need for less refuelling stops on intercontinental trips and a plane that could reach the Antilles non-stop) decided to purchase a Boeing 737, for the hefty sum op 89 million euros?!
The alternative, IIRC an Airbus (European....), would have cost about 18 million euros less. And here's the fun part: authorities deny and deny again that the fact that Wax is practicing for a licence in, oh, what number Boeing was that again, has anything to do with the decision.
No, one cannot fly an Embraer with a Fokker licence. He would have to retrain anyway. The way it was put in the Pilots forum was the other way around: the governement decided "if it ain't Boeing I ain't going" and that is why he choose to train for the 737. Maybe KLM has 737's and it would thus be cheaper to maintain them? It would not make much sense to train on a type if he can't fly one regularly. He would lose the licence.