Should I ask for the different car seat?

hi

So my in-laws wanted to buy a baby car seat from my registry. After they’d bought it, my parents suggested we could swap it out with one of those seats that grow with the baby, the ones that work for newborn up to 100 pounds you know? The price is about the same, and I know she wouldn’t mind exchanging the gift but for some reason I want to keep the seat we have now. Should I just ask to exchange it? 😂