Dupondius Volusian - Pietas

VOLUSIAN. Æ Dupondius. Rome, early 253 AD. Obv. IMP CAE C VIB VOLVSIANO AVG Radiate, draped and cuirassed bust r. Rev. PIETAS AVGG SC Pietas standing l. with both hands raised; in field l., altar. RIC 258b (R²); C - Very rare. Same obverse die as the Dupondius with PAX AVGG reverse from the CNG Mail Bid Sale 72, lot 1675, from the 2nd emission (early - mid 252): [IMG]http://www.acsearch.info/images/18/173711.jpg[/IMG] Do all these rare Dupondius issues belong to the same emission? ARS ANTIQVA auction 2, 4 Oct. 2001, lot 462