Different by design.
Meshtastic and MeshCore are LoRa-focused ecosystems with firmware, applications and familiar device roles. Reticulum works at a broader networking layer.
A Reticulum network can use LoRa through RNode, but it can also use Wi-Fi, Ethernet, serial links, TCP, UDP and other supported interfaces. LoRa can be one part of the network instead of the whole network.
