I agree with Josh that CD is the heart of evolution historically, including for Darwin, who did not limit the mechanisms to natural selection alone, even though NS was the most important for him. Prior to Darwin, “transmutation” (the word used by French evolutionists and adopted by the English with no changes in spelling or meaning) was about CD, and it was still about CD for Darwin, who actually never used the word “evolution” in the first edition of Origin of Species, which ends with the final word “evolved,” which is the only use of that word in the whole book.
For a couple of generations after Darwin, many biologists accepted evolution (in the sense of CD) but not “Darwinian” evolution (where NS was the main driver). Peter Bowler refers to this period as "the eclipse of Darwinism,’ but CD was not under attack in the scientific community.