Shane --

You may want to post this question on the Flags Message Board: http://history-sites.com/mb/cw/cwflags/

Bear in mind that nearly all Confederate regiments carried different flags at different times. Also, flags carried by other regiments in the same brigade would have been of the same pattern, probably being issued at the same time. Check on the existence of other flags carried by other units of the brigade during the period you have in mind.