LACP of 10G and 40G ports

"so can we use different port other than management or data port for snmp and syslog?"

Sure can. Typical physical appliances have 8 ports in addition to Management. I have one setup where 4 ports are used for data (client-side + server-side VLANs), 2 ports used for HA and traffic mirror (single VLAN for both functions) and 2 ports for ASM remote logging on a dedicated VLAN. You can use this aggregated interface for snmp and syslog instead of remote ASM logging.

Obviously, a single 10G interface would be more than enough for syslog and SNMP, however, as with any physical appliances, it's always best to go with LACP links to have that extra insurance against link failures. Fibre cables cost nothing compared to loss of logs due to an interface failure.