Just say yes (you just have to confirm the name change).
And if you can’t and get an error instead, just wait as cachyos needs to resync everything with base, this can take 1 day. (I had none of these issues, so if you do have any this means your mirror is slow, so you have to wait until it updates, or use another mirror). That said -> just wait a little, it will sort itself out automatically.
Archlinux is renaming these packages in preparation of kde6. This is a very rare occurrence that usually never happens, but kde6 is releasing in February so the preparations begin.