CREATE TABLE table_204_442 (id DECIMAL, "institution" TEXT, "location" TEXT, "enrollment" DECIMAL, "nickname" TEXT, "varsity\ sports" DECIMAL, "rugby\ since" TEXT, "head coach" TEXT)

how much longer has the north carolina wolfpack been around compared to the tar heels ?
SELECT ABS((SELECT "rugby\nsince" FROM table_204_442 WHERE "nickname" = 'wolfpack') - (SELECT "rugby\nsince" FROM table_204_442 WHERE "nickname" = 'tar heels'))
SELECT ABS((SELECT "rugby\nsince" FROM "table_204_442" WHERE "nickname" = 'wolfpack') - (SELECT "rugby\nsince" FROM "table_204_442" WHERE "nickname" = 'tar heels'))