Several sources I have found(e.g. https://www.quora.com/How-can-we-differentiate-between-x-rays-and-gamma-rays-if-both-have-the-same-frequency-and-wavelength) imply (at least to me) that there is a difference between x rays and gamma rays that have the same wavelength. The most common being is that they are produced from different sources, which is true, but does this matter? Surely, as electromagnetic waves(I would also not expect there to be any difference in quantum theory), they are the same thing just named differently. If I were to examine a wave in space that had a frequency in the overlap, would I be able to tell which one it was?