Okay: What is the difference between GW $1 Coin Cover Series and First Day Coin Cover?

They would presumably both be from the first day. Is their precedent for this with state quarters, westward nickels, etcetera?
April 4 American Presidency $1 Coin Cover Series - G. Washington
May 1 Washington Official First Day Coin Cover
Latest Mint Product Schedule
April 4 American Presidency $1 Coin Cover Series - G. Washington
May 1 Washington Official First Day Coin Cover
Latest Mint Product Schedule
"It's not that the Irish are cynical. It's simply that they have a wonderful lack of respect for everything and everybody." - Brendan Behan
Proud Participant in Operation "Stone Holey" August 7, 2008
Proud Participant in Operation "Stone Holey" August 7, 2008
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This is a State Quarter.
Rex
Proud Participant in Operation "Stone Holey" August 7, 2008
Proud Participant in Operation "Stone Holey" August 7, 2008