Currently I am working on a project in Kosovo. After gaining autonomy the country "invented" their own CRS, which is driving me crazy sometimes. It doesn't even have an EPSG-Code, it goes by "Kosova Ref 01" and the SR-ORG 7392, 9079 and 9080.
I managed usual reprojecting, but today I encountered a significant difference in altitude. While e.g. Google Earth and some surveyor-data state, that the area is I am working on is between 1450 and 1600 m above sealevel, data using the Kosova Ref 01 says it is about 40 to 45 m higher. Is this possible, or did someone (maybe me) botch something?
tl;dr: Is an altitude difference of about 40 m between two CRS feasible?