They are both apples, but one is a cosmic crisp, the other is a granny smith. My ‘75 PR is more scooped, but not a ton more than the CPR. It has tighter and more usable bass than the CPR, and “chimmier” highs without being piercing. The thing that I couldn’t get over when I played them all back-to-back was the “clarity, “lushness”, and “sponginess” of the ‘75 campered to the reissues. When I plugged into the ‘75 it sounded like someone took a thick blanket off the amp, and removed a pedal from the chain that “sucks tone” (I was playing straight in, that’s just how I would describe the difference). After I bought it I was able to play it next to a great example of a vintage ‘65 PR that my amp tech owns, and with the same speaker we couldn’t hear a difference other than mine has a slightly “drippier” reverb (which I prefer). The silverface princetons are VERY similar to the blackface versions. I will say that I prefer the tremolo on the ‘68 to any other I’ve played.How does the 75 sound compared to the the 68 CPR and 65 PRRI? I have a 72 MusicMaster Bass amp, but that circuit is kinda weird so I dont know what late 70's Silver faced amps are supposed to sound like
My ‘74 MMBA sounds a lot like a tweed deluxe (they are known as a poor man’s Deluxe), so it has a lot if mid-range and can get ragged (in a glorious way) past 4 on the volume dial. The original Oxford died last year so I bought a WGS G12Q (low sensitivity, 20 watt speaker designed for Tweed amps) and it sounds even better! If you haven’t played your MMB and CPR in stereo (I just use my Boss DD-20 as a stereo out), let me know what you think when you do! You might never play mono again!