Of course you know the answer is try it and compare the sound.
Although many will tell you a transport is a transport (0s and 1s and all that) some have more digital jitter than others at the S/PDIF output, and some DACs are better than others at rejecting the jitter or reclocking the signal.
I don't know which model you have, but usually the more expensive better built older CD players also had better behaved digital outputs.
Only one way to know for sure.
Steve