Karma is a Sanskrit word meaning the fruit or result of action. The field of action is thought, word, and deed. Among the laws spoken of for that field is “like generates like”: action that helps others and the world returns as help.
Within the International Nath Order karma sits with Konditioning and the kleshas as the triad to overcome. Twilight Yoga is aimed at that work. Karma is the fruit. Kriya is action as a power. They are not the same word. This is not a moral scoreboard and not a grade. Sadhana is how the pattern is met. The three are listed on Keywords.