Can the word "pair" be used for two things that are not exactly the same but are part of the same package?
Let's say that we have two color schemes (or themes) for a computer program. One scheme is dark, and the other one is light. Despite the fact that they're obviously different, they're both part of the same package. How would this be described?
Add/Enable [xyz] themes, a pair of highly accessible themes.
Add/Enable [xyz] themes, a set of highly accessible themes.
Considering there are only two, I don't think that "collection" works, so I'm trying to decide between 'pair' and 'set.' I would be grateful for any suggestions.