Compilers, Is There a Difference?

i've always wondered if it would be possible for compilers to re order private members of class structures. There's definitely a point where you can't do that without there being changes to the behaviour of the programm, which ar but maybe not important. Short of having like tooling that can do that, i guess the only thing we can do is have better education,. For the developers, better education, ye y. Thatf that makes a lot of sense to me.