Syncing configuration to DR site

Not possible , what you can do is set  a scripts to copy out the  objects and copy the object out to the 2nd  DR cluster. This is easy todo if you standardize the  networks

e.g

MAIN-cluster

1.1.1.1   MAINHOST01

1.1.1.2   MAINHOST02

1.1.1.3   MAINHOST03

2.1.1.1   DRHOST01

2.1.1.2   DRHOST02

2.1.1.3   DRHOST03

Now what we do  is take a unix script to sed and replace  MAIN to DR and the network space and then copy the objects out to the DR.

Now when we activate the DR  they plumb the 2.1.1.1 2.1.1.2 and 2.1.1.3 devices in VMware and as a symmetrical configuration that matches the main-site

If you have minor differences in hardware you can form HA according to below refernece:

http://kb.fortinet.com/kb/viewContent.do?externalId=FD35376&sliceId=1

otherwise you need to move the subordinary member to DR site,

I generally for these decisions you need more info. Like:

The DR is it cold site or hot site ?

Do you have L2 connectivity between PRI and DR site ?

Do you have bandwidth ?

what you could do is enable admin-scp on cli and then get the config of the cluster via scp. HOwever even if the other FGT run the same FortiOS Version they may have different port layout or names etc so in most of the cases the config will not run without editing it.