I don't think the SA got the names wrong. Rose Poudre and Powder Pink are the same (just translations of one another). I think there are two different versions of Rose Poudre (Powder Pink). In the older Raf Simons bags, Rose Poudre is very light neutral pink. In the newer Maria Grazia Chiuri designs, Rose Poudre is more mauve-coloured.
Here are two Dioramas, both in Rose Poudre:
View attachment 3809158 View attachment 3809159
And then there's the more mauve (and darker) version called Old Rose which can look similar to Rose Poudre depending on the lighting.
@Raindropz412 you're getting a Rose Poudre Diorama. It's not the wrong colour, unless you wanted a darker colour which is called Old Rose. Just wait to receive it, and if you don't like it, then send it back and request the Old Rose. Or have the SA take a picture of both Rose Poudre and Old Rose next to each other (and any other similar colours), and pick the one you like the most.