The EMG and SFEMG are entirely different tests. I have had them both.
The EMG does use needles as well, but the SFEMG uses a different needle, but only in one place, roughly, and requires technique, and I have been told by some doctors that they will not do it as they are not experienced enough.

I think in order to get a diagnosis, I would try to get as many tests as I could, not as few, to determine if it was correct.

It is up to the doctor but I feel better having more than less.