Starter is pretty much the same as all flock/flock raiser. It contains only 1% calcium, compared to 4% calcium in layer feed. Then check the protein level, and stick with something 16-20%. More protein than that is not necessary. Stick with something decent, and fresh from your feed store.
If you are feeding chick starter grower, that has more protein in it than layer. Check your feed bag or look it up. Most chick starter grower is 18-20% protein. Layer is 16%% most of the time. I had a rooster in my flock that had layer feed about half the time. He lived a long life with no...