Roadster will be lighter, have a better drag coefficient, 2x the power (1500hp), 3 motors, 200 kWh battery (?).
According to Electrek's ride along the wheels are "fat" - 325mm rear/295mm front. Dodge Demon's are 315/40R18 Nitto NT05R. https://electrek.co/2017/11/17/new-tesla-roadster-halo/
Should be close!