Just to be more specific; a Kato # 6 turnout is 186 mm which is the same as the 7 5/16 inch (20-010) straight track. Since your 9 3/4 inch (20-000) straight track is 248mm, you just simply add a 2 7/16 inch, 62mm (20-040) section of straight track to get the same length as the piece you are replacing. If I have confused you, go to the Kato website(katousa.com) click on the n scale section and download the n track list.
Bob