SWOT appears to be more strategic than matched-pair analysis (aka pairwise comparison)—which is just a mere statistical method to get insight from an amount of data (e.g., for surveys, focus groups, evaluation of alternatives).
Indeed, SWOT allows an entity to have a 360-degree view of the place it occupies within its environment—a landscape snapshot. So it helps the organization define:
—what the organization really is (products, services, identity);
—where the organization is (market place);
—where the organization can go (options);
—where the organization should go (objectives);
So SWOT can be used as a gap analysis tool—to go from where we are ("as is" position) to where we want to go ("to-be" position).
And matched-pair analysis can be used to determine which is the best option out of the ones identified by a SWOT analysis (i.e., refers to the "where the organization can go [options]" above)