Sound Comparisons

I’m trying to figure out how to compare the original recording with a remastered rerelease to see if the artist added something or to see if the remaster is just revealing more of the original sonic pallet that we haven’t heard before. I have several tools at my disposal. I have my old reliable version of Cool Edit, Sony Vegas 12, and Adobe Audition 2015. I’m pretty sure that nothing has been added because some of the tracks in question have a noticeable tape hiss that I think would have been impacted by any modern effects added to the old recording. I just need a way to prove it technically so it isn’t just my ears that I’m basing it on.