What is the difference between OSPF LSA Type 4 and LSA Type 5?

OSPFv3 LSA type4 refers to (0x2004) Inter-Area Router LSA and  LSA type5 refers to (0x4005) AS-external LSA. The Inter-Area Router LSA performs the same duties for OSPFv3 as the type4 Summary LSA performs for OSPFv2. An ABR originates an Inter-Area Router LSA into an area to advertise an ASBR that resides outside of the area. The ABR originates a separate Inter-Area Router LSA for each ASBR it advertises.  The AS-External LSA advertises prefixes external to the OSPF routing domain; one LSA is required for each external prefix advertised. Hopefully this will of some help.