Hello and happy new year afterward. I just got the Su-27 on the January 1st and played some rounds with it.
After some rounds, I looked over at the Su-27SM and was wondering why the Su-27 doesn’t get the R-27ER standard, but instead gets the R-27R. I mean, hello, the Su-27SM gets the R-77 standard and not the R-27R. Can someone maybe explain because I don’t understand why the Su-27 gets the R-27R Standard Or I am missing some key details.
Standard Loadout of the Su-27

Standard Loadout of the Su-27SM

And both jets even have the R-27ER and R-27R