I cannot figure out the price reasoning for a flight from Frankfurt to Austin. Is there any real difference between 18G and 22G? 18G is showing 84 euro and 22G is 45. It is a Boeing 787-9. Thank you!

I cannot figure out the price reasoning for a flight from Frankfurt to Austin. Is there any real difference between 18G and 22G? 18G is showing 84 euro and 22G is 45. It is a Boeing 787-9. Thank you!
