i think that the main thing is that "in which gym you have trained...the trainer , and his methodolgy..."...

otherwise , in the world it is always the common rule :

"the northern division likes "kicking".."
"the southern divisions like "hand-arm technics"..."
"west divisions like "punching"..."
"east divison likes "grapling "..."

that's the common rule: kung fu (northern styles: emphasize has been given much more in kicking , the southern styles: emphasize given in arm technics ) , in karate (okinawa: arm hand technics, in north japan : much more "kicks") etc etc...

other parameters are also important, i think:

-5 x 3 min is a long duration where the fighters have been training accordingly much more in slow tempo if compared to 5 x 2 min ...
-change of the climate can make also bad effects on fighters ...training in a country with high temperature and than coming back to a cold country and starting to fight may cause bad effects on the condition easily...
-5 x 2 min (1 min ) euro fights (if i am not misremembering) has been created by the holland and japan organizations (kb- bonds) and people has been forced to fight in that much more speedy fight tempo...of course, the dutch and japanese fighters have been trained according to this speedy tempo , whereas most of the opponents(thais , french) have been coming from 3 min rounds origins...

briefly; if you have been trained in thailand in general with long rounds of training and came back to the 2 min fights , you would most probably be in difficulty...
every system has it's own, unique properties as people described above and poeple have to train according to them...

(the thais could get success in k-1 max very recent and it is very clear that they have been trained according to k-1 max rules...if they would insist on the common thai way -training , they would not be successful...)