Yes, Oxycodone is approximately 1.5 X stronger than Morphine. Doesn't matter on the dose....It's proportional.
Many think it's the other way around because the term "morphine" sounds impressive. Also, morphine was the "original" pain med years ago, so all the conversion tables & etc. use morphine as the baseline. Oxy is a synthetic med developed specifically (as were other like hydrocodone) to address tolerance, side effects, & etc. This all goes back to the discussion on opioids vs opiates.