That's a massive mis conception about supercars.
The cars themselves are actually radically different depending where it was originally manufactured.
The base of a monocoque chassis and RWD V8 is as far as it currently goes.
Want to win have 888 build you a chassis and pay for their experience to tune it.
There was teams buying componentry from 888 all week trying to find pace, if the cars were the same they'd all have the same componentry,