I've always wondered why the Botanist skill to increase yield has similiar styled icon as the icon for Miner's HQ chance increasing skill.

Here's both side by side.

Having recently come back from a half a year break and starting with gathering again, somehow I just constantly keep mixing up which's does which.

Maybe it's just me but I like some consistancy in my icons, like basically all the rest of the icons has between the two classes. So why are the Yield/HQ chance icons different?