From that article it seems using the Chevy frame was purely a cost saving measure.
"Canadian "full size" Pontiacs were actually closely related to Chevrolets, making use of the economical Chevrolet chassis and drivetrain, though with the American Pontiac-styled exterior body panels (They weren't the same as U.S. Pontiac panels since they had to fit the shorter-wheelbase 119-inch Chevrolet "X" frame. U.S. Pontiacs used a full perimeter frame.) and interior instrument panels. As Chevrolets under the skin, Canadian Pontiacs including the Parisienne used the same engines and transmissions as full-size Chevys....
Built in the same GM of Canada assembly plant in Oshawa, Ontario, Pontiacs had parallel model lineups as "full size" Chevrolets..."
Absolutely. The manufacturing costs for the limited Canadian market couldn't be sustained without sharing parts. It's the same with the "Plodges", Canadian Plymouth and Dodge line-ups...
"Plodge"
Plodge, a
portmanteau of the names
Plymouth and D
odge, is a name informally used to refer to vehicles Stellantis Canada built with a mix of U.S.
Plymouth and
Dodge parts for the Canadian and
export markets. This practice allowed dealers in Canada to offer a wider array of vehicles at lower development cost in the relatively small Canadian market.[
citation needed] For example, a Plymouth with a Dodge grille and taillights became a Dodge without the expense of tooling a vehicle for the market. On the
Dodge Dart introduced in 1960, only the interiors were shared; Canadian-market 1960-61 Darts had Plymouth dashboards. The 1965 to 1966
Dodge Monaco used a Dodge body, with a
Plymouth Fury dashboard and interior trim.[
citation needed] Not all Canadian-market Chrysler-built vehicles were
badge engineered in this manner, however; the
DeSoto Diplomat, for example—a rebadged Dodge Dart—was never sold in Canada, where DeSotos were similar to the US models. The Canadian 1960
DeSoto Adventurer looked like the American 1960 DeSoto but used the upholstery and door panels from the 1960
Chrysler Saratoga.[
citation needed]
The 1965 Canadian-market Valiant Custom 200 was a rebadged U.S. Dodge Dart.
The
Valiant was sold by both Dodge and Plymouth dealers as a separate make, as had been the original plan in the United States. 1960 to 1962 Canadian Valiants were substantially the same as American models, with minor trim and mechanical equipment differences. 1963-64 Canadian Valiants had U.S. Valiant front sheetmetal on the U.S. Dart body. 1965 Canadian Valiants were available in the full range of sizes and models offered across the American Valiant and Dart models, but all Canadian-market cars used Dart instrument clusters and were badged "Valiant". For 1966, the
Valiant Barracuda was the only offering in Canada on the U.S. Valiant's 106 in (269.2 cm) wheelbase, with no Valiant station wagons in Canada for 1966.[
citation needed]
"Plodge" vehicles include: