Reasonable? Audi Cabrio vs. A3

Hello dear friends of the well-kept car, I got a private leasing contract two years ago. Now I am the owner of an A3 8P Ambition 1.9TDI (130hp, ABT), 95,000km, year of construction 8/2003, Navi, FSE, MAL etc. The problem is: the car will be too expensive for me. I pay 350 Euro leasing rate + 130 Euro all-round. Now an inspection is also due and I am too high with the kilometer. With the convertible I love for a long time. I also discovered a nice one today: BJ98, 77,000km, leather, 1.8 for 11,000 euros. Now the difficulty: Would like to give the A3 in payment, but the leasing wants 16.500 euros for the A3. No dealer pays me that. I want to finance the convertible, so I would have to co-finance the difference (approx. 2000 euros). Now I don’t know what that looks like with the maintenance and taxes at the convertible, but I have the feeling that in the end I pay just as much thanks for your help Andy