It's not a pink fenestratus. They have a different body shape. The head on the OP's fish screams tilapia. Fenestratus also never have a smooth consistent color like that. They have a mix of pink and white and as they mature they get blackish blue tones mixed in. They never show that smooth consistent pink. I've kept catamaco fenestratus for 10 years and have raised a lot of fry and they never look like that. It's an Oreochromis, I can see why it could be easily confused though.
It's a fene and it is not solid pink based on the picture you posted and even if it appears that way at the moment it will not keep that coloration long term.
the OP's fish is not a pink fene and it was purchased as a red tilapia. There is zero reason to think it is anything other than that.