The Hidden Ones was a decent bite-sized DLC of Origins with nothing really new to show. The Curse of the Pharaohs is certainly a bit more Origins but they have something new to show, i.e the afterlife. Bayek ventures into the mythological lands and fights more fantastical creatures. At least in terms of visuals, it's certainly new for the series and the four different afterlifes all look great. That said, you're still doing all the same stuff you've already been doing throughout the main game. You're still climbing viewpoints, clearing out forts and doing fetch quests. I'm not entirely certain what was happening in the story in regards to the mythology. It may have been an all been an illusion but I'm not sure. I didn't find it particularly interesting regardless. I still had a decent fun but I was growing tired of the loop especially after having played so much of Origins.