Well all I can say is my Rheumatologist said to me upon diagnosing me after years of suffering, I have good news and bad news, the good news if you dont have rheumatoid arthritis, thats a crippling disease, the bad news is you have fibromyalgia, BUT whilst you are in pain and there is no cure you have the peace of mind knowing will never be crippled up like you would be with RA..

so no, they are different entirely.