Yes, it is.
I personally see chord progression as sets of notes that move diatonically or chromatically.
Let's say you have C, Am, F, G...
To go from C (which is CEG) to A (ACE) you need to change the G to A: one step! And if you play a C6 (CEGA) You have only one note to remove, or maybe you just have to consider that you're playing the C6 (CEGA) followed by a Am7 (ACEG) they are the same notes, but in another order!! You can do this with the two other chords...