If you loved DOS2, it is highly likely you'll love BG3 too because despite their different experiences, they're sharing similar foundations. Party movement, interactions, exploration, design etc...
In terms of combat DOS2 is very flashy combat with lots of freedom inspiring the player to be creative with their demigod abilities, whereas BG3 is very grounded combat within an established DND ruleset that is more about overcoming challenges as a random nobody with imposed limitations.
Personally as someone who never played a turn-based game before BG3's Early Access; I had no issue getting into it with absolute zero DND knowledge. Fell in love with its gameplay so hard during Early Access' opening month, but wanted to play something actually finished and that is how DOS2 came into the picture to scratch the itch despite being a different experience. Both games are one of my absolute favorites today.
Overall BG3 is far more simpler to get into and far easier than DOS2, one should have no issue. The dice are only a concern when it comes to dialogue choices, in combat they barely matter even in Honour Mode. Equipment and feats rule supreme.
