It is becoming apparent that the Charisma yarn is not consistent. The new ball is knitting a narrower scarf than the old one.
With my brother’s help, I found that the new yarn is less dense than the old. I ripped out the new knitting and found a heavier yarn in the same dye lot. I’ll be weighing the yarn from now on and using balls with similar masses. Luckily, I have a food scale for weighing small objects.