Would a barnacle's DNA be more similar to the DNA of a crab or that of a limpet Explain?

Barnacles are crustaceans, and therefore more closely related to crabs than to mollusks like limpets. The apparent similar morphology of barnacles and limpets is a result of convergent evolution. It does not necessarily require DNA (i.e., similar genotype) in order to produce similar phenotype (physical characteristics).