For me if the muscle pain hasn't gone away in a few days then it's definitely my lupus(usually my lupus muscle pain is unbearable which is way more painful than just regular workout muscle pain) I know everyone is different but that's how I know and it took me a long time to figure it out
I never try to distinguish any longer. I would drive myself nuts. I just treat it. If it seams exstream, I mention to my dr.
For me muscle pain from lupus is 100x worse and stronger than working out muscle pain
I just go with the flow deal with what is going on day to day you will go insane trying to figure it out.
I can't really tell sometimes.