The B-29 was most definitely turbo-stumper charged. Fortunately the Constellations and DC-7 were not. The turbo-supercharger used a back pressure and thus put a load on the cylinder. The DA an EA series engine that were "Turbo-Compounds" used a blow-down turbine utilizing the exhaust gas velocity and imposed no back pressure on the cylinders.
The BA series of engines used on the B-29 an L-049/149 Constellations was a difficult engiNe to work. I never worked the b-29 but knew many vets who had. The power section cowling on both was poor. The fuel injection lines were an add-on. The engine leaked oil and made sludge. If you had a clean engine it probably had developed an injection line pinhole leak. Did I mention the engine mounting system? The attached to the engine by the rear cylinder heads, High-tension ignition added to the problems.
The BD and later series engines had little relation to the BA series. The final series, the EA were on later L-1049 , L-1649 and DC-7 including the C. Good engines but too late to save Wright's reputation.