“Swap” used car that I bought

We bought a used car today (from a dealership) and got the base model. When we looked at the cars we had our baby and toddler with us so it was kind of quick and chaotic. I didn’t really realize that even tho the car we were purchasing was way newer than our old one, it didn’t have all the features I was looking for. After leaving the dealership and driving in peace I started to notice that maybe I should’ve gotten a higher trim package. I looked on their website and they have one (no photos yet so I’m guessing they just got it in today) for $500 more. It was 13k miles vs the 9k we purchased but in my opinion that’s not much of a difference. I commute an hour + to work so I spend a lot of time in my car. Do you think they’d be receptive to me calling in the morning to see if I could look at the car with the higher level trim package and possibly “swap” them and pay the $500 difference in cash? My mom also bought a car from them yesterday because she came when we first saw the car and I told her we were having a food experience and since she needed a car she also went with them. Do you think I’m being unreasonable and should just be happy with what I got or is this a reasonable ask?