I typically used the refrigerator manufacturer filters because I could always find them discounted someplace.
Not so with our new LG, so for the first time I bought after market filters. The LG were stupid expensive and being I have worked with carbon in marine and freshwater aquariums for about 50 years I know how cheap carbon is and I know the mark up.
So with that said I do think there is some difference in filters overall. I have cut open past filters and meant to cut open our after market filter but threw it out by mistake, it will only be another month or two when I change it again and will put it open but I already know it will be 100% fine. These filters are nothing more than a super dense fine tube of activated carbon. I could tell when I changed it out it was substantial.
Anyway, these are the after market I use, it even came with claimed NSF tests. IT is also the more expensive product from the same manufacturer. I am confident they do everything the OEM does if not even more.
Like I said, keep in mind like all filters, there is a cheaper version and more expensive. I choose the more expensive. "Plus" version because it is still cheap to me.
BTW- The fit is perfect and leak free. Not sure if you have the same model number but here here is a link
This is what they claim but doesnt matter, Im sure when I cut one open it will be the same carbon spool as any other OEM.
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