Auto exchange BMW with dealer

Hello I have a BMW 118i 2021 year of construction with 48000 km and a panoramic roof now I have seen on Mobile that someone offers a BMW 116d with 55,000 km automatic transmission to ask if he would be interested in an exchange since I prefer to drive a diesel you think the dealer makes with such a deal. So theoretically he could sell it for exactly the same price or for a bit more