The cutting that I purchased as D. oiantha has much more elongated leaves than D. geri so I would have to say that they appear to be different in my mind. See Photos below:

Dischidia oiantha

Dischidia geri
The cutting that I purchased as D. oiantha has much more elongated leaves than D. geri so I would have to say that they appear to be different in my mind. See Photos below:
Dischidia oiantha
Dischidia geri