In some ways they are. There is little philosophy in chemistry, and philosophy is so wide a subject as to be almost meaningless. That there is such a thing as the philosophy of science underlines that we have to be careful here. That's not to say in any sense that I disagree that a statement that they are distinctly different would be wrong, but rather that to think it is all just the same is also problematic.
You are treading a little too gingerly here...
Science is a subset of philosophy and tries to be more precise and methodical as compared to other areas of philosophy. That's all.
Like everything else, it is a spectrum too with spiritual philosophy at one end of the precision scale, then social philosophies, ethics, politics and so on.......then psychology, medicine and biology. chemistry and finally physics/maths at the other end.