In most forms of racing, the cars are now nearly identical. Tire and fuel management, coupled with driver intelligence wins races.
F1 has had some great disparity in aero. Mercedes nail the first turbo-hybrid in..2014? but the others caught up after a few years. Aero however is the real sticking point these days with limited tunnel and CFD time.
Modern F1 cars look the same, but if you scrutinize still photos you can really see the differences in the side pods.
Ironically, Red Bull in the ground effect era (which just ended) had the most dominate car in 2023 until Checo crashed (Monaco?) and the crane lifted the car high enough everyone saw the underside. After that teams brought aero packages which closed the gap and led to McLaren's two-peat in the WCC.