Each season was unique. I have them all. There were also variations between countries. And then the syndication intro was unique to the post-original run. Almost none of this is present on official DVDs, but slipped into syndication by accident due to what appears to be last-minute additions/replacements. Remember that not all episodes are in the syndication packages (which also vary country to country -- with USA/Canada being most restrictive due to apparent licensing rights between NBC and Warner).
I'm still building my own DVD set, using the official DVDs as replacements for a few key episodes. I have the full run in top quality, but some are imperfect copies. I was purposely waiting post-movie to finish my set, since it had already taken so long.
Let me finish my work for the year, and then get back to you during hobby time.