I spent an hour replacing the frames in UN44 and found that they did not show in the Mix Neutral dialogue.

In the end, I realised that it's not UN44 this mod's used, it's monprt44.def, a new def added in ERA 3 after the release of this mod.

I hope this finding is helpful for mod makers, especially Grossmaster and Suft, you both have added new creature sprites for your mods and you should probably consider updating their related icons.

Download the updated Pikemen/Orcs icons made by toriko94