But they weren’t passing overhead at 3 times the speed of sound............
Sonic boom is sonic boom. I’d guess Mach 3 ia a louder boom than Mach 1.7.
M114 155mm Howitzer - Muzzle velocity 563 m/s (1,847 ft/s) (Mach 1.69)
8 in Gun M1 - Muzzle velocity 866 m/s, Mach 2.6