Wikipedia em "DNS multicast":
It is a zero-configuration service, using essentially the same programming interfaces, packet formats and operating semantics as the unicast Domain Name System (DNS).
Wikipedia em "Resolução de nomes de multidifusão de link local":
The Link-Local Multicast Name Resolution (LLMNR) is a protocol based on the Domain Name System (DNS) packet format that allows both IPv4 and IPv6 hosts to perform name resolution for hosts on the same local link.
Então, sim, os formatos de pacote são todos iguais.