public enum FirstEnum
{
    FirstValue,
    SecondValue
}

public enum SecondEnum
{
    FirstValue,
    SecondValue
}

public FirstEnum[] first = new FirstEnum[]{ FirstEnum.FirstValue,
                                            FirstEnum.FirstValue,
                                            FirstEnum.SecondValue };

public SecondEnum[] second = new SecondEnum[]{SecondEnum.FirstValue,
                                              SecondEnum.SecondValue,
                                              SecondEnum.SecondValue }

public void WorkWithEnums(Enum[] myEnumValues)
{
   // ....
}

WorkWithEnums(first);
WorkWithEnums(second);

WorkWithEnums(first.Cast<Enum>().ToArray())