Sameness is a Persuasion Pathway and is covered in Part 2, Chapter 4 of The 7 Skills to impress™ book.
Sameness is paired with Difference as a Persuasion pathway. No matter how different, any two things can be similar or the same in the mind of a ‘Sameness’ person. For a Difference person, the opposite is true.
The way someone frames these elements will predict how they react to pressure. And it helps us phrase speech in an influential and inspiring way.
See also Difference