H4 Extension of spouse and H1 Extension date would be equal or vary??

Hi , My H1B VISA has expired on 12/31/13 and applied extension and it has been approved on 03/17/14 And today got a notice from USCIS says that my wife H4 VISA is valid from 01/01/14 to 12/31/14. Can I expect whether my H1 also would be valid for the same period or any chances it may vary ??? Please advice. Thanks in advance.