I would expect thawing a tab to present me with the tab as it was last time I saw it, no reload; whereas, being a link, I'd expect a bookmark to load the current version.

... Actually the latter is incorrect, in truth I'd expect bookmarks to present me with the exact version I had in front of me back when I bookmarked it, including if the site is temporarily down, has vanished, or if I navigated a more recent version.