CREATE TABLE table_203_41 (id DECIMAL, "name" TEXT, "variant name ( s ) " TEXT, "source" TEXT, "source coordinates" TEXT, "length" TEXT, "mouth" TEXT, "mouth coordinates" TEXT)

what is the difference between the length of english canyon and the length of munger creek ?
SELECT (SELECT "length" FROM table_203_41 WHERE "name" = 'english canyon') - (SELECT "length" FROM table_203_41 WHERE "name" = 'munger creek')
SELECT (SELECT "length" FROM "table_203_41" WHERE "name" = 'english canyon') - (SELECT "length" FROM "table_203_41" WHERE "name" = 'munger creek')