22 extra long RF questions


some say that swiss and american ( or italian) made 22 extra long RF cartridges aren’t the same thing.Is it true?
I have both versions of this cartridge ( swiss and italian ) and the only differences are that the swiss one has a case that is 0.5 mm longer than the round made by fiocchi and that the swiss round has a different bullet shape whereas the italian one seems to be assembled with a standard 40 gr 22 LR bullet.According to me these 2 cartridges are interchangeable

Thank you,