The mods are completely different codebases, built from scratch, and not compatible. There are certain features in common, like tighter position/word order rules and (full version only) replacing entities to improve their naming scheme.
I should restate that I took a lot of inspiration from it. The original idea was to emulate/remake The Language Overhaul on the vanilla dictionary to my exacting tastes, though it's certainly grown beyond just that. There's a lot of places where I've cross-referenced our work: the idea to have X of Y names, some word choices on symbol lists, and so on.

The Language Overhaul:

• Uses its own (~1000 words) dictionary for a more evocative and controlled dictionary, and has more freedom to add custom words when needed.
  
• Must use custom Overhaul-compatible translation files. The default setup is based on historical & Tolkein languages, though they did provide a "PUrist" version modifed to work.
  
• Emilovich: "if it adds new civilisations with languages, then it's likely not compatible unfortunately :( "
  
• Symbol lists are focused on quality over quantity
  
• Thumbnail appears to be AI-generated

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The Way the Words Work:

• Uses the same dictionary as vanilla. All 2,196 word tokens used by vanilla are used.
  
• Note: The English translations of certain words have been changed, such as "furnace" to "forge." It still counts as [WORD:FURNACE], and thus the Dwarven word is still "sarvesh".
  
• Uses default translation files, unchanged. It can also use any vanilla-compatible translation - as most mods that add a new civ language are set up to rely on vanilla's dictionary. This allows for proper mod support.
  
• Generally expands symbol lists, though certain expansive symbols (FLOWERY, NATURE, ARTIFICE among them) have been redesigned to fit how they're used in hardcoded ways (godly spheres, buildings)
  
• Some extra entity-specific symbols specified to add specific names for guilds, wars, hospitals, etc