It all depends on the context of the piece and the style. Do you have an example?
Let’s say A7 to C7. You could play Am pentatonic on both chords. The c gives a more bluesy sound over the A7. You could play both the c and the c# over the A7. You could play C mixolydian over both chords. You could also go octotonic or change scale every chord. But as said without a concrete example and context this becomes too theoretical
Let’s say A7 to C7. You could play Am pentatonic on both chords. The c gives a more bluesy sound over the A7. You could play both the c and the c# over the A7. You could play C mixolydian over both chords. You could also go octotonic or change scale every chord. But as said without a concrete example and context this becomes too theoretical