CREATE TABLE table_203_814 (id DECIMAL, "season" DECIMAL, "head coach" TEXT, "overall record" TEXT, "conference record" TEXT)

how many more seasons was marty brill head coach compared to tom conley ?
SELECT (SELECT COUNT("season") FROM table_203_814 WHERE "head coach" = 'marty brill') - (SELECT COUNT("season") FROM table_203_814 WHERE "head coach" = 'tom conley')
SELECT (SELECT COUNT("season") FROM "table_203_814" WHERE "head coach" = 'marty brill') - (SELECT COUNT("season") FROM "table_203_814" WHERE "head coach" = 'tom conley')