Bit more info, i am lead to believe:
There will be no weight penalty applied to the third car, because SEAT are classed as registering 3 cars/drivers at the start of the year, hence the different car numbers.
James and Darren will start the weekend with the same success ballast, based on James's current position in the championship, which is 5th so they will have an extra 9kgs applied to the base weight on both cars. Jason will carry an extra 36kgs on top of the base weight, as he is 2nd in the championship.
James's car will race at Valencia this weekend, stop briefly at SEAT Sport in Barcelona for a quick re-fit and come overland to the UK ready for Silverstone.
The front will be yellow, but the rest of the car will be in Red Bull / WTCC colours.