One is later and has slightly different value on input circuit.
I wouldn't waste money on either but look for a good deal on a Lynch Grail instead.....somewhere in the $low $100 range.
You can mod a Recto/Rectified to Grail specs but the Lynch one is the best base Rectifier tone *IN MY OPINION.*
That's assuming you don't want to step up to a fully rework JF Erect or similar. (usually well over $200 used)