The network management is R81.10 JHF81 (lets call it server1) , the endpoint manager R81.10 no JHF (lets call it server2).
Tried following the steps from the link you mention. I installed GAIA on server2 and configured it as SecurityManagement. I connected to server1 with SmartConsole. Tried to add a checkpoint host corresponding to server2 so that I could enable the Endpoint Policy Management blade on it. Couldn't install the database on it because of SIC. So we ended up connecting SmartConsole to server 2 to perform those steps but of course that created a seperate DB on server2. I can restart the install of the endpoint management since there is nothing on it yet.