First, you have to compare the material covered in AP Music Theory to the various examinations in theory that the RCM requires at its various levels. Presumably you know that there are progressive requirements for RCM theory from
- Rudiments (Levels 5, 6, 7 and 8 (basic, Intermediate, Advanced)
- Harmony (Level 9)
- Harmony and Counterpoint or Intermediate Harmony (Level 10)
- Harmony and Counterpoint or Advanced Harmony plus Analysis (ARCT diploma level)
If the Syllabus https://www.rcmusic.com.
(enter "theory requirements" in the search box) doesn't answer your questions, contact RCM with your questions.