Types 2 and 9 both tend to reference their attention to others and have a hard time knowing what they need or want. Both tend towards (conscious) suppression and (unconscious) repression of their anger. Both are “positive reframe” types in conflict. One thing I’ve noticed is 2s rarely see themselves as 9s while 9s can see themselves as 2s. On the inside, they are very different. One important distinction that’s a little easier to catch, is 2s are much more focused on how others respond to them than 9s. 9s are ultimately self-forgetting and 2s ultimately see themselves as indispensable in other people’s lives and want to be see that way by people who are important to them.
Types 1 and 6 look alike as they both are often big worriers and tend to procrastinate. They are both compliant to the demands of their superego (often internalized parent figures) and both are highly attuned to processes, roles, procedures (the counterphobic 6 may challenge or oppose these processes, but they are still quite aware of them). They both can be extremely hard on themselves (and sometimes on others) as they have a whole list of internal “shoulds” and both can use a large dose of self-compassion. On the inside, things are quite different. One of the more important distinctions is emotional reactivity: 1s are contained and controlled and 6s are more emotionally reactive and often feel others are taking their concerns too lightly.
Remember when trying to determine your Enneagram style, you need to look less at behavior and more at the underlying motivation of WHY you do what you do.