I ordered the sticks in the original grey and yellow colours, because the original sticks of my controllers were very worn out.
The shape and materials are close enough, however holding them side by side you can notice that the replacement ones use a thinner plastic. The color is a bit off and the rubber also has a cheaper feel to it.
The grey replacement stick also lacks a small "cut-out" hole at the bottom, that makes it so the stick doesnt touch a small resistor on the pcb, when its rotated. Instead the whole "bowl" at the bottom is smaller, so there are small gaps, when you push the stick to one side, and some dust can get into the controller.
The biggest flaw is, that the holes in the stick stem are too deep and the sticks cannot be rotated correctly, because the underside of the big analog stick touches the controller shell.
This can be fixed by inserting a small piece of paper into the stem hole, so the stick doesnt go in as deep. After this small mod, it works well enough. However its still an annoying thing to keep in mind and I don't know why it is produced like that.
These are fine to refresh some old controllers but they are definitely not a 1:1 replacement. I will probably buy different ones instead, next time