Some companies have stronger cultures than others, and are seen by the external world accordingly. One way or the other, that culture impacts you. This value convergence is a terrific thing. Never belittle the importance of common beliefs. That is what makes the world go round, and should be celebrated.
Great companies have great values.
But, recall that your system of beliefs and values is much bigger than any Company's. If you want a tip to help work your way through this, write a personal mission statement. Be clear what you really stand for, and where you are going. Then use this guide to your own value system to see how you should behave in your chosen Company. This is the easiest thing to do of them all.