Q. Are proteins with the same number of each dissimilar amino acid that forms them necessarily identical proteins?
Even if many proteins have the same number of each different amino acid that form them, for example, 70 glycines, 50 alanines and 20 histidines, the sequences in which these amino acids are connected may be extremely different. So if two or more proteins are in such condition of numeric similarity for each type of their constituent amino acids, they are not essentially identical.