CVN test of combined welding procedure

A combined PQR: GTAW (3 mm) and SMAW (5 mm) and SAW (32 mm), total base metal thickness of test coupon is 38 mm.

May a single set of weld metal impact test specimens be used to qualify two or three above processes or procedures?

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ASME IX 2017: Yes, make sure the weld metal of each process is included in each the specimen.
AWS D1.1 2015: Yes, see 4.26.2, figure 4.28 and table 4.14.

Exactly, your PQR of GTAW (3 mm) and SMAW (5 mm) and SAW (32 mm) will conduct the test for root and also for cap.