There's just one issue, it's a generic F1 car. Not the RB20 that comes with the base game. Which does look different than the Merc and Ferrari. However your skin is of a Ferrari style or Mclaren looking car with a RB wrap on it. The base game RB has the upper inlets on the sidepods and and bigger shoulders on the engine mount than the rest of the cars.
https://www.overtake.gg/downloads/red-bull-package-templates-simplified-erps-serps-use-to-release-your-own-red-bull-mods.70106/
But be aware that it will still have the FOM chassis