I installed them on a
I installed them on a mac pro 2013 and I think they only work on those machines or similar. the i-mac has smaller ones, if I'm not mistaken, So-dimm. then you have to see the frequency and capacity you need.
Greetings

Unfortunately Yes

I got it wrong, you ask me if they also go for PC, right?
This I do not know
You have to see the characteristics
and the frequency and pin count of your slot.
Usually DDR Rams have similar and compatible characteristics, just respect what your PC manufacturer recommends.