Keep in mind that these are two different chemicals.
MMS involves drinking chlorous acid.
CDS involves drinking chlorine dioxide in water.
Chlorous acid has a little chlorine dioxide in it, but it is mostly chlorite.
It is yet to be seen if it is chlorine dioxide that is beneficial, or if it is chlorite.
In food processing, chlorine dioxide doesn't work very well, but chlorous acid works great. In water purification, chlorine dioxide works great, but chlorous acid leaves to many chemical residues.
Even though chlorous acid and chlorine dioxide in water both have chlorine dioxide, they are very different chemicals and react differently.
a 3 drop dose of Miracle-Mineral-Supplement has about 200 PPM available chlorine dioxide with about 48 PPM of that as free chlorine dioxide. It has a PH of around 3. The concentration of free chlorine dioxide varies depending upon the activation time.
the supposed "similar" CDS dose has about 25 PPM free chlorine dioxide and a PH of around 7. Some have proposed using a dose with 50 PPM free chlorine dioxide.
As you can see, both contain chlorine dioxide, but there are differences.