Not really similar
Livramento never made a senior appearance for Chelsea, only had a year left on his contract and wasn't signing an extension, they got £5m and both a buy back and sell on clause
Hall is way more "proven", played around 10 games of senior football and still has a number of years left on his contract
I think getting him for £30m would be a very good deal, obviously he hasn't played a lot of football but I've been impressed with him whenever he's played and I think Howe could work wonders with him