DCT vs Converter Automatic

Hello together, today I picked up my new Proceed GT from the dealer and put the first 30km back with it. (puh,that stinks at first quite nicely when driving) But to my actual question,I come from a 5 Series BMW 525 I automatic (E39). So far I thought that there is a significant difference between the two automatic gearboxes when driving. With my E39 it rolls automatically as soon as I leave the brake. A few days ago I read somewhere that the If you walk off the brake there and don’t give a gas, you would roll back in contrast to the converter. To my surprise, it wasn’t like that. I was standing at the traffic lights today with my procedure at a mountain. When I left the brake, the car immediately started (rolling on) without having been on the gas. So is there no difference between the converter and the DCT? VG Mike