Hi today i have checked C++ API Reference code in cryengine then compared with C++ API Reference in unreal engine.So my question is C++ API Reference unrealengine and cryengine code are not the same ?
I don’t know if my question is confuse.I mean both are c++ but the way how they coded are not the same ?
To make an analogy, the instruction manual for an oven and for a fridge are not the same, even if both of them are written in English 
But yeah, they are two separate engines after all.
So if we choose to learn all game engine it’s very consume time that’s why we have to choose one game engine Thank you.