I looked up the definitions and cloning appears to be a subset of propagation.
Cloning : producing individuals with identical or virtually identical DNA, either naturally or artificially.
Propagation : grows new plants from a variety of sources: seeds, cuttings, and other plant parts. Plant propagation can also refer to the man-made or natural dispersal of seeds.
I suggest re-tagging the cloning questions that are not really about that and adding tag descriptions for both would be of great assistance.