Integrate Checkmk cheks into nagios interface

Hello,
I need to migrate from old Nagios 4.1.1 server with CheckMk 1.2.6p11 on it.
I have installed Nagios 4.4.5 on new servers and Checkmk 1.6.0p8.
On old servers, almost everything is configured over CheckMk config files but it is showing on Nagios interface as well.
On the new server I am not sure how to integrate checks from Checkmk to show on nagios interface also.
On the old server in nagios.cfg there was only one line that pointed to /usr/local/nagios/etc/check_mk.d/ directory but on this new Checkmk is on completely different paths than version 1.2.6p11 and I am not sure how to tell Nagios to look for hosts or services on Checkmk.
Can someone please help with this.

Thank you in advance.