No, all the cartridges discussed here have different base sizes:
8x75 is the “standard 8x57, .30-06” base, 11.94 mm = .470”
10.75x68 has the base of the Swiss 7.5x55 Schmidt-Rubin, 12.55 mm = 494”
9.3x64 Brenneke is 12.88 mm = .507”
8x68S and 6.5x68 are 13.2 mm = .520”
.404 and 9.3x70 are 13.82 mm = .544”