Their RVSM FL's are different from anywhere else.
That is because to fly in their METRIC RVSM airspace you must fly in FEET using the published conversion table. You cannot fly in METRES as it is not a direct mathematical conversion.
The controllers also use a table to convert the metric Mode C readout on their screen to the correct cleared metric flight level.
Clear as mud?
P.S. They certainly do use KM to measure distance when applying radar separation. Normally 10KM is minimum radar sep. Other times 30 or 75 KM will be applied for flow purposes.