Yes, but the amount of difference you make at a company isn't directly proportional to the career value of making that difference. If you make a difference at a company with over 50% growth, that's almost always going to be more valuable to a career than making an equal difference at a company that's going to go bankrupt in a couple years. Similarly, making a small difference at a high growth company will arguably have more value than making a larger difference at a low growth, stagnant, or failing company - assuming your difference doesn't reverse that trend (which it likely wouldn't, regardless of magnitude).