YES AND NO! Just as there is no definitive authoritative legal standard for pate brisee (that I know of) there is no definitive standard for American pie crust. Your generalizations about the preferred fats are generally true though.
I wasn't splitting hairs quite that much, and definitely not restricting the use of pate brisee to tarts. Here is what I was talking about:
http://dictionary.reverso.net/french-english/pâte brisée
Kokopuffs makes a salient point on difference between interpretation of language verses ingredients between American and French pastry.
By law, butter in the US must be a minimum of 80% butterfat. In France, law mandates a minimum of 82% butterfat. Aside from butterfat, fermentation is a differentiating factor between French and American butter. In France, the cream is rested up to 18 hours before its churned. During the rest period, the cream naturally ferments, essentially becomes creme fraiche, then it's churned into butter.
French butter is often called cultured butter. American butter is labeled "Sweet Cream" which refers to the unfermented cream used to churn the butter. American butter is in fact so bland, manufacturers add flavoring to give it some defining characteristics.
Aside from the tangy flavor imparted by the culturing, the texture is altered by the higher acidity. The fermentation also gives the butter a mailable quality that is not found in American butter, and increases the melting point. These qualities contribute to a more tender crumb and better rise, especially in yeast doughs.
The Vermont Creamy in the US produces an excellent cultured butter with 86% butterfat. The owner of the dairy lived and work in France before opening her dairy; her butter is produced in the same manner as French butter.
Butter in the US labeled "European Style", like Plugra, is not cultured butter. Rather, it's sweet cream butter with a butterfat content similar to the levels found in European butters.
Beurre d'Echire is the gold standard butter for many bakers in France. It's has AOC status (Appellation d'Origine Controlee) and is produced by a collective of only 66 farms. So availability is limited, but it is available online and in some gourmet grocery stores. The butterfat in Beurre d'Echire is 84%.
When using a French butter, you may not be able to make 1:1 conversion. You have to take into account the difference in both butterfat and the gluten content of the flour used. While French butter has higher butterfat, French flour has lower gluten content than American flour. So in addition to the differences in butters between the countries, flour differences also attribute to the marked quality and flavor differences between pastry produced in France and the US.