Adding second node to A/P HA

When adding a secondary node to HA, do I have to define the interfaces on secondary node? More specifically, the primary uses a LACP LAG to connect to core switches. 

Do I need to define the LAG on the secondary, or will that config sync?

I do have the core switch ports configged for the LAG, not sure if need to define on FGT prior to enabling HA.

Thx,

Dave