CREATE TABLE table_204_538 (id DECIMAL, "pos." DECIMAL, "driver" TEXT, "co-driver" TEXT, "car" TEXT, "time" TEXT)

which driver drove the same car as luis serrado ?
SELECT "driver" FROM table_204_538 WHERE "driver" <> 'luis serrado' AND "car" = (SELECT "car" FROM table_204_538 WHERE "driver" = 'luis serrado')
SELECT "driver" FROM "table_204_538" WHERE "car" = (SELECT "car" FROM "table_204_538" WHERE "driver" = 'luis serrado') AND "driver" <> 'luis serrado'