iirc:
c.p. – is the point along the chord where the distributed lift is centered.
a.c. – is the point along the chord where lift changes (or the sum of lift changes)take place
c,p. is rather static and a.c. will move depending on aoa, dyanmic pressure (q), and other variables.
Hope this helps as a starter, someone else I'm sure can expand and/or clarify further.