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In answer to my own question at the end of my last Post, here is a Parcel Card fragment with a Trident used at a later date than the previous Money Order fragment.
In this case, the fragment was used at GRINEV CERN[ihiv] on 18 5 21. The 20 kopeck stamps are unoverprinted but the 2 kopeck imperforate hidden at the bottom of the reverse of the formular has a Kyiv I Trident overprint.
Unfortunately, it is not posible to work out how the different stamps were revalued to meet the charges for the parcel - these would have been written on the missing bottom left of the card