if i Instantiate object, then immediately call RPC on it

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How reliable is execution timing?
For example if i Instantiate object, then immediately call RPC on it
will it guarantee that its always called on same frame before Start() for all clients?

var my = PhotonNetwork.Instantiate("my");
my.RPC("Initialize",param1,param2,param3);


or is it if on bad network it may happen that object is instanciated, then on other frame "Initialize" called?