Goodl luck.
I am saying this stuff for the ninth time now. Afaik, urrent brave search base links were taken from google. See Search Quality at Cliqz Building a search engine from scratch. So, the current results are very similar to google.
But, brave search is in fact independent of any other search engine. It has it own crawler, index mechanism and a way to make it less google like. To do it, you need to enable Wed Discovery Project (WDP).
Also, check tweets from brave ceo nitter.kavin.rocks/brendaneich/with_replies/. Go to few days back, he details everything as to why the results are google like and how to make them not google like.