I'm a dual citizen (US/EU) so I have two passports but first name and middle name flipped:
Given Name: Name1 Name2
Given Name: Name2 Name1
All the spellings are the same, it's simply the order of the given names. I'm legally known by those two names in both countries and in the EU country there's no such thing as "middle name". I'm wondering how much of an issue it will be with airline agents when I need to show I can enter EU without the upcoming ETIAS (before it would not be an issue since I can enter EU with US passport without any preapproval so I just showed US passport but entered/exited EU with EU passport).
Thank you in advance.