Are these two rifles identical in dimensions?
The short answer is NO.
Some parts are interchangeable such as sights, triggers, sears, etc...
Also from a personal perspective the actions feel different.
Not quite sure how to put my finger on it but the bolts on the m48 feel lighter and less smooth to operate. Coyuld just be me but I have yet to find a standard length mauser 98 I didn't like, where-as the M48's just feel lacking a certain je ne sais quois.
The M48 action is an intermediate Large Ring mauser 98 ,(Large ring, Short action) 1.410 diameter. receiver ring, 8.50 in length, with action screw spacing of 7.620" Intermediate Large ring have a threaded shank diameter of 1.10 in. With 12 threads per inch.
Mexicans by FN and Belgium, the M24, M47, M48 by FN and Yugoslavia. This M-98 short is considered an intermediate action, and WILL NOT fit a Standard 98 Mauser stocks and standard bolts will not interchange.. Receiver stripped weight 15.0 oz.
Standard Length Large Ring Mauser 98
1.410 diameter receiver ring, 8.750 in length, with screw spacing of 7.835. Barrel Shank of 1.100. Large ring have a threaded shank diameter of 1.10 in. With 12 threads per inch.
Including M-98's from WWI and WW2, GEW-98,M-98k, CZ-24, VZ-24,Spanish M-43/44 . Chilean M1912, Steyr Brazilian M1908/34, Brno 98/22, 98/29, DWM / Argentine. M1909, M24/30 Venezuelan, FN M1935 Peruvian, FN Standard Model, Mauser Oberndorf. Receviver stripped weight 15.5 oz.