Multiple unicast-hb-peer ip in same subnet in fortigate

Currently we are having Fortigate VM deployed in AWS in different regions.

We have only one port configured for HA-SYNC between two fortigate VM as shown in this diagram. 

https://docs.fortinet.com/document/fortigate-public-cloud/7.4.0/aws-administration-guide/229470/deploying-fortigate-vm-active-passive-ha-aws-between-multiple-zones

On the diagram it was given with 10.0.2.11 to primary

and 10.0.12.11 to secondary

Question :

Can we configure another HA-SYNC interface (for eg: port6) on the same subnet range as Port4 as shown in diagram above. Below will be the configuration 

10.0.2.12 to primary with port 6

10.0.12.12 to secondary with port6