"Community Partners (formerly called Local Moderators), are Jagex partners/employees.[1] When they speak in-game they have a purple crown (Local moderator crown.png) next to their name, and on the forums they have a purple glow around their posts, as well as a purple avatar background.
They help out new players, setup events, and communicate with the player base in-game and on the official RuneScape Forums.
Like Jagex Moderators have Mod in their nicknames, Community Partners can be identified by the prefix CM, although this is something everyone can do, unlike using Mod on the nickname."
https://runescape.wiki/w/Community_Partner#cite_note-1
"We'll (the Lmods'll) be in and out regularly to help with the day-to-day stuff, forum moderation, working with the volunteer moderators and, of course, you!"
https://archive.fo/R2yg7#selection-667.0-662.5
Lmods have more administrative authorities and they get in touch with Jmods directly AFAIK.