
Nicholas C. answered 06/27/19
Bachelors in Professional Music from Berklee College of Music
I think I can help with your question, though you seem to be correct in your description. C to G is a perfect 5th interval. G to C is a perfect 4th interval. An interval is just the space between two notes. If you change the notes around, the intervals are going to change too.
Hope that helps!
-Nic