At the time the Monacos started appearing, I was familiar with the '73 LTD styling and regarded the Monaco as a copycat design. Then I began to wonder about Chrysler Corporation's viability if it was becoming a styling imitator rather than an innovator. Actually, this concern proved to be well-founded, because Chrysler's financial position deteriorated to the point that it had to accept a federal government bail-out in 1979.
In retrospect, aside from the possibility that Chrysler hires of Ford stylists around 1971 tipped off what Ford was planning for 1973, it's likely that similarities were a matter of parallel thinking in terms of product packaging for full-size sedans as well as the prevailing styling zeitgeist. There must be retired Chrysler stylists active at the time who could step forward to explain what probably did cause the lookalike situation.
For now, let's take a look at the cars.