Prater is making 89.5 percent of his FG attempts this year, which is better than any season of Bass's: https://www.pro-football-reference.com/players/B/BassTy00.htm.
As for XPs, Prater is at 91.9 percent this year (low for him, but a couple of doinked uprights), while Bass was at 92.2 percent last year. Indistinguishable on that front, really, and if Prater makes his next two XPs, he'll be better than Bass was last year.