Here are 2 x files. Both are 44.1/16 wavs. One was initially exported as a 16 bit dithered wav from the initial 32 bit floating file, the other was a 320kbps mp3 that was encoded from the same 32 bit source file. Both were imported into a 16 bit Cubase project and then re-exported as 44.1/16 bit files.
Check 'em and let me know how close you judge them to be?
For the record, I chose this track because it's simple and exposed (OK, and because I had it handy); I know it doesn't test dense or loud or swirly cymbals - you can't have everything :-)!
I flipped a coin to decide which track became "1" and which became "A" and then flipped again to decide which order to place them on the page, and then again to decide which way-round to ask the question below, then again to decide which way round to put the options, so it should all be pretty free from bias on my part.