Lately I have been buying Kouros flankers and so far I got

Energizing Tonique
Sport Cologne eau d’ete summer fragrance (blue clear bottle)
Eau de Sport (first flanker 1988)
Kouros Frachieur

I can see there is cologne sport and 3 more cologne sport iterations of eau d’ete
Are they quite similar and owning one is enough or there is considerable difference that warrants buying them all .
Thanks