Edit - Disclaimer: I have not swapped the sliders before, but I have opened up and modified an 87U and Novatouch recently.
Should be doable, except for the lower left control on the RF because it uses a weird design to accommodate that LED. One part that's risky is removing the sliders from the RF, because they each have a tiny tab that keeps the sliders in their housing. You can very carefully use a flat screwdriver on the tab to remove the sliders without breaking the tabs, or just use enough thumb force to remove the sliders but breaking the tabs in the process. I don't think breaking the tabs has any adverse affect on the keyboard's function so it should be okay if you want to save effort and don't mind it.
If you do go through the process of changing the tabs, I recommend doing a flattened landing pad silencing mod on the Topre/Novatouch sliders. It makes typing on the keyboards a lot quieter and more pleasant, imo.