The reverse side of the counterfeit panda coin was having no
denomination and this can also be seen on many fake panda coins from
previous years. Also there are minor differences in the design. Just
compare the bamboo leaves on the ground and the tree-tame at the side of
the panda's arm.
Because both coins are made in China it could be true that only fake
coins with no denomination on it are legal to make by the Chinese
government else there would be a denomination on it for sure. The fake
panda coins are silver plated, and if you see this in a specific auction
then you know also that they are fake coins.
I would advice to buy only Chinese panda coins from trusted coin
dealers if you are not a coin expert in seeing the differences between
fake and real panda coins.
A fake panda coin is worthless and a real
silver panda coin, like the ones graded by the NGC, are a good
investment for later and in the mean time nice to collect.