They're not exactly the same. Moritz has outlined the basic differences of their two protocols thus:
"Dr. Clark's liver cleanse does not involve softening of stones before the flush, which makes it easier for the stones to pass. Harder stones are much more resistant than those softened with apple juice or malic acid, and special herbs, if need be. She also does not advocate cleansing of the colon before and after the the flush, which by itself can prevent successful cleansing and cause potentially harmful side-effects (inflammation, infection, toxic blood, skin problems, etc.). She says, though, that without parasite cleansing prior to the liver flush, you won't get out stones. This, however, applies to mostly those who don't take the above measures."
Flushes are ancient. Neither Clark nor Moritz invented anything.