Some comparisons
CIP dimensions are;
9.3X62;
L1 = 51.79 mm (to shoulder)
L2 = 54.22 mm (to en of the shoulder-neck)
L3 = 62 mm (total lenght)
R1 = 11.95 mm (Rim (head dia))
P1 = 12.10 mm (Base dia)
P2 = 11.45 mm (shoulder dia)
H1-H2 = 9.92 mm (neck dia)
MAP = 3900 bar (56 550 PSI)
Capacity = 4.96 cu.cm (76.35 grains H2O)

9.3X66 SAKO;
L1 = 55.80 mm (to shoulder)
L2 = 58.20 mm (to en of the shoulder-neck)
L3 = 66 mm (total lenght)
R1 = 11.95 mm (Rim (head dia))
P1 = 12.13 mm (Base dia)
P2 = 11.43 mm (shoulder dia)
H1-H2 = 9.92 mm (neck dia)
MAP = 4150 bar (60 175 PSI)
Capacity = 5.11 cu.cm (79 grains H2O) estimated

9.3X64 Brenneke
L1 = 52.09 mm (to shoulder)
L2 = 55.28 mm (to en of the shoulder-neck)
L3 = 64 mm (total lenght)
R1 = 12.60 mm (Rim (head dia))
P1 = 12.88 mm (Base dia)
P2 = 12.05 mm (shoulder dia)
H1-H2 = 10.04 mm (neck dia)
MAP = 4400 bar (63 800 PSI)
Capacity = 5.50 cu. cm (85 grains H2O)