The later approved one is your final status.

来源: 于 2008-08-06 14:11:49 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Since it is the same day, I think you should call USCIS ASAP.

Usually, the later approved one is your final one. You should cancel your F2 application when you submit your H1 application.