How to identify between common rose chafer, big rose chafer and copper chafer?

Didn’t find anything online

In Cetoniina you need to photograph both back of beetle and “underside” of it, you need to look at the shape of outgroth between front legs.
e.g. look here http://insectamo.ru/coleo/49-zhuki/scarabaeidae/531-cetonia-aurata
http://insectamo.ru/coleo/49-zhuki/scarabaeidae/3150-protaetia-aeruginosa (speciosissima)
http://insectamo.ru/coleo/49-zhuki/scarabaeidae/2487-protaetia-metallica (cuprea)
between those three, all have different colour and ornament of elytrum too.

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Thank you