- ALINE version: latest 1.7.6 website
The website doesn’t have the correct docs for those two methods. They obviously do different things, but SetMatrix is not well documented, imo!
I took a quick look, and it looks like it’s covered in the description for the two methods. Looks correct to me? Maybe I’m misreading really hard 
PushMatrix says:
This differs from PushSetMatrix in that this stacks with all previously pushed matrices while PushSetMatrix does not.
PushSetMatrix says:
This differs from PushMatrix in that this sets the current matrix directly while PushMatrix stacks with all previously pushed matrices.
I don’t know where I found it. Sorry 
It’s really documented. Why didn’t I see it?
It’s no problem! 
I literally do this everyday, so I’m just pretty used to reading through the documentation at this point haha