Last I checked Sandworms didn’t have:

• a tongue, beaked or otherwise,
• a bunch of tentacles that could grab and pull food in
• an apparent inability to move

If you’re going to generalize that much, to say they’re the same… does it really matter? It’s not like Herbert didn’t add to sandworm cannon either; so further explanations to what a sarlacc even is shouldn’t be discounted either.

I wouldn’t even call a sarlacc a worm, to be honest.