I took better pictures of both 1996 Shenyang, Shenzhen front and back. There is definitely a difference.
This is what I can tell for now:
1) XiongMao_Ag was correct, there is a shoulder difference. The coin has pointy top shoulders vs round. (very obvious)
2) Tamao42 seem to also be correct. There is a small date large date variety.
3) The left leg of the panda on the coin is larger in width then the other. Also the curve by the ankles and leg is better defined on the other.
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