Unknown projectile

Hi every one

I receive some photo about unknown projectile
Mybe it is 23mm

1- what do you think about?
Are there 23mm?
2- are there API or HEI?

The yellow ones with composite fuze are 20x102 HEI, typical M56 type.

The ones with one-piece caps (remnants of black paint) appear to be AP or API.

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THANKS for your helping

Here some info:

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i hope the HEI are destroyed by EOD because they are fired and maybe very instable