I think perhaps you misunderstand the purpose of calibration? Calibration exists BECAUSE screens aren't perfect. The calibration process finds those deltas (which exist, but are different, for every single screen in the world) and corrects for them.
Oh yes, you do need the Spyder.
The Eizo software works with a range of calibration devices to achieve the high quality colour representation that Eizo is famous for.
But I haven't heard if Eizo have recently updated the software to provide compatibility with the newest Spyders.
Your English is fantastic!
Oh! Well, the Eizo has its own "Color Navigator" software. I have a ColorEdge here too.
Do you know if your version of Color Navigator is compatible with your new Spyder?