So, not sure who came first, but this mod has the Pressure Forge and the Kiln, which share the same sprites as the Petrochemical Facility and Arc Furnace of the Age of Production mod.
Any chance these could be changed (or let me know if you are the original)? It's a bit confusion with the duplicates.

Those graphics are part of a set made by Hurricane046. (https://mods.factorio.com/user/Hurricane046)

A sizeable chunk of Factorio mods draw upon them, so overlap like this is bound to happen. Just think of them as similar buildings by the same architect, like Assembly Machine 2 vs. Assembly Machine 3.

Ok, but those ones have different colours at least, so they can be easily told apart.
These are actually identical.
Could you please tweak them?

Lots of mods use same assets, kinda comes with the territory, programming skills are more frequent among game's target audience compared to being able to make 3d models. It's best to just get used to it. Also, personally i prefer to have similar looking assets that looks good than some cheap blue/purple/red recoloring that many modders use.