(1) She wasn't as seriously injured as we thought.Do (1) and (2) have the same meaning? What about (3) and (4)?
(2) She wasn't injured as seriously as we thought.

(3) Thankfully, he was wearing a helmet, so he wasn't injured as seriously as he might have been.
(4)Thankfully, he was wearing a helmet, so he wasn't as seriously injured as he might have been.
Yes, same meaning.
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