On the amethyst duster/long cardigan, I finished the back piece, carefully measured before finishing off the shoulder/neck.
Did the front left piece and carefully measured before starting the shoulder/neck.
And the back piece is now measuring an inch longer than the front.
The lacy bodies match, row for row, just from the underarm upwards.
It is plain stockinette too, nothing that should stretch out.
For now, I am not taking anything out.
I will finish the front right piece to match the left front, then I'll see what is going on, and if necessary, frog a bit on the back panel.