Answer: The name of the pattern in which these signal words ("unlike" and "similarly") would probably be used is comparison-contrast.
Explanation: One of the patterns of organization of a text is comparison-contrast, which consists in establishing the similarities and the differences between two items, ideas or topics. "Unlike" and "similarly" are two signal words that are usually found in comparison-contrast essays. "Unlike" is used to indicate differences and distinctions, while "similarly" is used to establish similarities. Other similar signal words that are present in these type of essays are "likewise", "as well as" and "in contrast".