Hi!
The sorting rules for this locale must be the same in both platforms.
Only locale names are different.
I think they are less alike than you hoped, because if they were alike,
you wouldn't be seeing this problem.
Possibly you could try running contrib/amcheck on the index in question
and see if it reports any issues.
I tried and it reports error
ERROR: item order invariant violated for index "desktop_baas_liigid_idx"
DETAIL: Lower index tid=(3,15) (points to index tid=(16,4098)) higher index tid=(3,16) (points to index tid=(17,4098)) page
lsn=292/630C0CE8.
SQL state: XX002
Andrus.
