does the main progression 'shape of you' by ed sheeran go i VI iv VII or i iv VI VII? both orders sound like the original song to me.
they are both extremely similar, 4min and b6maj are sister chords. but they did it as 1, 4min, b6, b7. in this case, wherever you hit the 4min (as opposed to the b6) will feel a bit more 'pensive' where as the b6 will feel a bit more 'power' that's the only way i can really describe the difference