How are Lutheran weekday “prayer services” different from “matins” or “vespers”?

From Wikipedia, matins : > Lutherans preserve recognizably traditional matins distinct from > morning prayer, but "matins" is sometimes used in other Protestant > denominations to describe any morning service. Assuming that the claim is true, what makes "morning prayer service" in the Lutheran church distinctly different from the matins? Perhaps, the matins has a particular structured order and is a specific form of the "morning prayer service"?