“Bro”, butter is literally just a hydrocarbon. As in carbon atoms and hydrogen atoms.
Making it in the lab produces chemically identical molecules.
As in, literally the same thing. Like actually for real no difference. Including however bad or healthy it is to eat.
Any nuances in the real thing will be from impurities that would have to be added to the lab produced stuff, should you want to.
The real difference is how it is made, not in what it produces. Meaning the synthetic option can be produced without livestock, and potentially using much less energy and land.