Then does that make it an "imperfect" clone? I thought they really were supposed to be exact clones. Hmm...interesting!
They are genetic clones, but they might not be identical physically. I believe that the expression of white markings can be influenced in utero.
Identical twins separated by time, clones and their donors may have phenotypic (physical expression of a trait) differences, such as differences in markings. Their genotype, or genetic makeup, is identical, but their phenotype, such as the placement of a particular marking, differs. A clone may not be indistinguishable from its donor, but it'll be the closest possible match.