When does a car stop being the car it was?

I recently watched a video where the frame of a land Rover was replaced and it got me thinking... Is there a point where it's just not longer the same car? When is it gone? After a motor swap? All the body panels replaced?

Have some Toronto rice for your photos

And yes, that's a V6 badge on a civic...

EDIT: i'm thinking for uni body cars it's when the Unicode is replaced..

But for body on.frame....idk