Different color fonts / logos?

Bought size 42 bostons off depop and 41 from end clothing uk site and they both different. Depop seller says he bought them from Birkenstock website. Does anybody know why they have different shades of blue on the footbed and also the logo on the side? 41 has a much firmer toe cap as well 42 is worn but only a couple times and they’re soft as hell. Now im starting to worry that the 42’s are fake