Are racial bonuses the same as species bonuses? They should be the same thing, but raw you could get a ysoki with a +2 racial bonus to engineering with a crafty graft for a +2 species bonus to engineering.
Interstellar Species first page:
A NOTE ON TERMS
This book uses the word “species” in place of “race” and “racial” for the purposes of building a character, playable species traits, bonus types, and similar rules elements—this change doesn’t otherwise affect the mechanics of these elements, and it applies across all Starfinder products.