Yes, either could replace the 1N60P.
From what I've read, BAT46 will behave differently and transition into distortion more abruptly than the Ge diodes, but whether that's discernible by the human ear or in a live-band context, I don't know.
You could always socket the diodes and compare them when you get your hands on some 1N60P, then solder in the type you like best after their audition.