Papo's scale problems

[Aeglil]

I ordered a few ungulates online, most of them being Collecta models, with a few Schleich. I also decided to add some Papo figurines for all the animals that Collecta hasn't released yet (Chamois, dromedary, impala, greater kudu and blue wildebeest).
As I unboxed all these models today, I had a bad surprise. Papo's are oversized when I compare them to my other models.
The only exception being the dromedary, which looks fine when I display it next to my Bactrian camel, dromedaries being naturally taller than camels, and Collecta's model being just too small.

What should I do ? Return the models to the online store where I ordered them and hope that for Collecta or Schleich will release their hypothetical own versions of the same animals ?
But I guess I will keep them anyway and display them in a separate place, so they wouldn't look out of place among my other figures.
Next time I will check the dimensions before ordering.