7.62x39 primer color question

What’s the difference in primers?
Both are headstamped “3 96”
The black primer reminded me of bxn primers.

These here were made by Ulyanovsk Cartridge Plant “UPZ”.

The blackened primers have a separate moisture seal as they were used with cartridges not packed in the typical tins but in sealed plastic coated cardboard (called “Tetrapacks” in Germany as here it is used for packing milk and fruit jiuces etc.).

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