It is the same EAC number.
When your card is ordered the message will change to
"On XXXXXX(Date), 2003, after approving your application, we ordered you a new card. Your card will be mailed to you as soon as it is ready. "
When your card is mailed it is changed to
"This case has been approved. On XXXXX(Date), 2003, an approval notice was mailed. If 14 days have passed and you have not received this notice, you may wish to verify or update your address. To update your address, please speak to an Immigration Information Officer during business hours."
Hope this helps
Silentmember