#Powershell 48 bytes

    param([char[]]$a,[char[]]$b)![bool](diff $a $b)

Cast incoming strings as an array of char.  Use `diff` (`compare-object`) on the two objects and cast as `bool`.  Since a blank result (`diff` only shows differences not similarities) is `False`, negating it with `!` will result in true for identical strings.

Added benefit: it will work on any arbitrary length strings (if equal whitespace).