Yes and no.
Yes in the sense its a massive world that feels alive and you have gear to upgrade etc etc but other than that not really. Its far more ‘adult’ ‘cinematic’ and ‘narrative’ driven. Its focused on quests and holds a natural RPG progression where as Breath of The Wild is a lot more ‘Go nuts and kill gannon’ and thats all the direction you get.
The Witcher is focused on delivering exceptional direction and voice acting where as Breath Of The Wild is purely gameplay and wonder foucsed. Both fantastic games that do two different things very well and are both games with MASSIVE scope and craft.
They’re both good for exploring, reward exploration, in different ways. For example in The Witcher 3 you could help someone in distress just by hearing cries of help in the forest which could lead into a lore rich side story.
I say go for it, there is an easy mode (which isn’t BORING) if you find the systems overwhelming.