car Seat dilemma

Abby
I have a very trivial situation I'd like to ask for advice on! My husband and I are expecting twin daughters, and we couldn't be more thrilled. My aunt (bless her heart) was so generous to take me out shopping to choose the car seats we want for our girls! What a blessing!! I chose some while we were out that day. She tried to buy them the day of, but they only had one in stock, so she decided she'd order them both online. We had plenty of time, so this didn't worry me one bit. 
Well now my twins are expected to come early, and the car seats just finally got here. I went to open them, and they are the wrong color! Instead of the black and white that we wanted, they were bright pink. Is it rude to try to return them for the correct color? We were gifted a double stroller that matches the ones we picked out, and I just really want them to match and look nice. I also dont want to seem ungrateful for the incredibly generous gift that she gave us. What would you do?