Because of the relatively low price, I bought last week the Swift Green cartridge SGF-W01. This provides the shape and fitting as the original cartridges. They can also be used simply and therefore seem to fit.
The problem, however, is that the warning light, which indicates the due replacement of the cartridge continues to burn.
This would normally be automatically or run out after prolonged pressing the "Reset" button and then change to green. Since this is not the case, one can not therefore assess whether the exchange has really worked or whether the cartridge and the fridge, everything is OK.