Sorry to bring some kind of disappointment perhaps, but the WWF-thing is for the German sets only!
The "Wild Life" Theme for the Benelux-market (and thus probably the other international markets) has different schemes on the vehicles, and the sets have different numbers...
Pandas:
5272 Germany / 5414 international
Gorillas & Okapi:
5273 Germany / 5415 international
Car with tigers:
5274 Germany / 5416 international
Elephant & Rhino:
5275 Germany / 5417 international
The car has a WWF-print or sticker in the German set, but a zebra-print or sticker in the international sets: