I have the same question and I think it is still not answered. In December I bought the wine starter set (black) and then a champagne stopper with holders (white). In a first test, I screwed a champagne cartridge into the wine set (black) and filled a champagne bottle with it. A few days later, the pressure on the cap was very high when I took it off, so I think it all worked. The champagne was still sparkling and good in my opinion. The only thing that unsettles me is the filling. Somehow it is not clearly audible/recognisable when the bottle has enough gas. Are the black and white rods built the same? The caps and cartridges are different for champagne and wine.

Thank you for the answer.
What I actually wanted to know is whether, if I buy an additional champagne stopper as an accessory for the Wine preserver, I can also use it to close champagne bottles:
Are the champagne closures compatible with the Wine preserver?

According to research, the product is suitable for all wines - except sparkling wines.