There's nothing 'wrong' with the baby being back to back. Plenty of babies turn before or during labour. Some stay back to back and are born that way. And while it might be more likely that you'll have a longer labour and sometimes a more painful onel, it's not necessarily a guarantee of either fact. Some women have perfectly manageable labours and deliveries with babies in an op position. Some women have a baby in a ROA position for example and find it unbearably painful and long. It doesn't mean anything for definite.
I had two back to back babies and two longish labours (31 hours and 38 hours). Both turned to transverse during labour and got stuck. I tried to move both of them to an oa position during pregnancy. Neither budged a jot. However, one labour was very painful, one was in all honesty, completely painless. I had no drugs for either.
My advice is to try and turn them if you think it will give you peace of mind but don't feel you have failed or that it's a terrible omen of a bad labour if the baby doesn't turn round. During labour- and this is whatever position your baby is in - do what is right for you. Listen to your body. If you want to stand or lie down or sit or kneel or moo or screech or sing the Proclaimers hits, DO IT. If you need pain relief, have it. Each labour is different and it's all down to luck. You don't have to struggle on or refuse pain relief because you feel like you've failed or some such hokum. There is no right or wrong. Only right for you.
Best of luck. The baby at the end of it will be smashing, I'm sure.