Actually, the new Maruti Suzuki Swift 2020 is available in both petrol and diesel with manual as well as automatic transmission. However, the Maruti Suzuki Swift Hybrid was showcased at the Auto Expo 2020 and talks are that the car will be launched in India towards the end of the year.
As for the engine, both the 2019 and 2020 seem to have the same engine capacities. The engine capacity for both the cars is 1197cc and both have 4 cylinders. Maximum power is 61 kW @ 6000 rpm and maximum torque is 113 Nm @ 4200 rpm. Both the engines are also BS-6 compliant.