GM B-Body: 1977 and after

I have been told by members of a social group devoted to 1973-77 A-Body "colonnade"-style that the new 1977 downsized B-body
(Caprice, Bonneville, 88, and Le Sabre) was no more than an A- body frame with a new body bolted onto it.
Is this true???
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On Sat, 18 Jul 2015 19:35:47 -0700 (PDT), snipped-for-privacy@gmail.com wrote:

I don't think so.
https://www.opgi.com/blog/index.php/decoding-general-motors-body-style-designations
From 1976 to 1980 – “A-Body” cars include – Buick: Century, Regal. Chevrolet: Malibu and Laguna, Monte Carlo. Oldsmobile: Cutlass. Pontiac: LeMans and Grand Am, Grand Prix. “B-Body” cars include – Buick: LeSabre, Riviera (’77-’78). Chevrolet: Impala, Caprice. Oldsmobile: Delta Eighty-Eight. Pontiac: Catalina, Bonneville, Grand Ville. “C-Body” cars include – Buick: Electra 225. Cadillac: Fleetwood Brougham, Deville, Calais. Oldsmobile: Ninety-Eight. “D-Body” cars include – Cadillac: Fleetwood 75, Fleetwood Limousine (’77-’80). “E-Body” cars include – Buick: Riviera. Cadillac: Eldorado. Oldsmobile: Toronado. “F-Body” cars include – Chevrolet: Camaro. Pontiac: Firebird. “H-Body” cars include – Buick: Skyhawk. Chevrolet: Vega, Monza. Oldsmobile: Starfire. Pontiac: Astre, Sunbird. “K-Body” cars include – Cadillac: Seville. “T-Body” cars include – Chevrolet: Chevette. “X-Body” cars include – Buick: Skylark. Chevrolet: Nova, Citation. Oldsmobile: Omega. Pontiac: Ventura, Phoenix.
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What several members of the "Colonnade" group said was that in order to downsize the full-size Caprice, Bonnie, Delta 88 for 1977 they just built those on the existing A-body, which had a 115" wheelbase vs the 120"+ wheelbase of the outgoing B- bodies.
To downsize the A-bodies(Monte Carlo, Grand Prix, Cutlass, et al) for 1978 model year, they created a new 110" wheelbase platform.
Just looking for some validation on that first phase, because while I understand that reusing existing platforms can save money for an automotive behemoth like GM, it suggests that "all new for 19- so-&-so" may be a bit deceptive marketing to buyers.
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