Is it correct, that the easySPLIT has a standby-current of only about 25 mA and however the OCB-version has 120 mA.

Yes, that is right.

The normal easySplit has a lower standby-current because the relays, which is switching off the AIS and FM – radio while the VHF-transmission, does not need a current during the standby mode. However the pin-diods inside the easySplit OCB need a standby-current.