I recently acquired a 9.9HP Evinrude, 1992. I bought this manual off Ebay for reference. When it arrived I found that although it was published in 1992, it was really for 1993 engines. Are 1992 and 1993 9.9HP Evinrude/Johnson's the same or will I get in trouble using a 1993 manual for a 1992? Thank you.