For many cars yes but given how widespread GT3 is, I doubt they had the hardest time securing an actual older Huracan GT3 and Audi R8 LMS Evo from someone (Hell, the Nissan GT-R GT3 is an actual GT3 car so why not). Same for the Aston Martin Vantage GT4.Almost certainly the teams are made up, and the cars are just production chassis with body kits. I'm kind of shocked they got someone to lend their Ford GT to this.
Definately not the Z06 GT3.R, just a slightly modified C8Would be cool to see them ingame tho , btw notice that 720s GT3 , Camaro GT3 and that C8 GT3.R (?)
The actual car:
Edit: Just noticed there is actually two of them in that second image you posted.