Do these two CSS classes do exactly the same thing?

Is there any conceivable difference between :
.a {
     position:absolute;
     height:100%;
     width:100%;
and
.b {
     position:absolute;
     top:0; right:0; bottom:0; left:0;

They do not do the same thing.  Class "a" will abide by the inherit margins of the parent container since no positioning information is given, thus defeating why the element is absolute as opposed to relative, whereas class "b" has a position set

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