Update:
This answer was based on the assumption that DM iswas a programming model. It defines logic and programming strategies that allow the creation of an algorithm, parallel in this case.
fact that PRAM is a computing model, but Dervin pointed out that DM is, an abstraction of a parallel computer. It defines costs on memory access and how procesos can work and communicate. You can also build an algorithm directly into thea computing model though.
That is the main difference. In some places you may find that they use and exchange the two concepts as if they were equal, but thatwhich is not healthycorrect.