Similar, yes. Approaches to the patient can be quite different though. Rheums are internal med trained and therefore tend to use a lot more Rx meds. Also they tend to see a little different patient population. They see RA, SLE, AS way more than we do. PM&R tends to get more problems of spine (HNP, DDD), weakness and numbness and disabilities.
I work in a multi-disciplinary clinic (10 ortho, 2 podiatry, 2 rheum and myself). The rheums send me mainly spine as they don't like it much. They occasionally send me a patient for spasticity or nerve blocks. I send them pts who need DMARDs or a thorough rheum workup - I order the basic labs, but don't really get into all the antibodies and such that they look at.
Otherwise, we see a lot of simiilar patients and do a lot of similar treatments. I write for more PT, they write for more meds. We both do joint injections and TPIs. Rheums are generally trained to Dx and Tx on disease models, while PM&R looks at it from more aof a functional standpoint.
Rheums also tend to do more hospital consults than most outpt MSK PM&Rs. The last inpt consult I did was over a year ago. Our rheums go to the hospitals most every week.