两种Approval 有什么区别

搜自己的receipt number前后的号码，发现有两种approval的status。这两种有什么区别么？

Case Was Approved And My Decision Was Emailed

We approved your Form I-129, Petition for a Nonimmigrant Worker, Receipt Number WAC181455xxxx, and emailed you an approval notice. Please follow any instructions on the approval notice. If you move, go to egov.uscis.gov to give us your new mailing address.

Case Was Approved

On May 3, 2018, we approved your Form I-129, Petition for a Nonimmigrant Worker, Receipt Number WAC181455xxxx. We will mail your approval notice. Please follow the instructions in the notice. If you move, go to egov.uscis.gov to give us your new mailing address.