I'm creating the HA Pair via FMC, i have same interface, but the error show "Peers do not have same type of interfaces", anyone can help?
FTD Platform: 2 x FTD 4120
FMC & FTD Version: 6.4.1
They appear to match from the screenshots you provided.
Have you inserted transceivers in any of the interfaces and, if so, do they also match?
It appears you are doing everything correct. Perhaps opening a TAC case would be best way to resolve this.