Perhaps in the sense that it was a political exercise meant to demonstrate that anything the West could do, the Soviets could do too. Same with their B 29, no doubt, though that was a true case of reverse engineering and they would have picked up valuable insights into production processes, etc.
Bingo! You got it. Stalin wanted B-29s and had asked the US for them repeatedly, but the US denied them. The next best thing was to reverse engineer it. The B-29 was not obsolete; it was still in production and it was the most advanced strategic bomber in service in '44, 45, so the captured machines were a coup for the Soviets. The big thing about reverse engineering the B-29 was that it introduced new alloys to Russian industry, new materials that had never been built, levels of precision never been achieved and new weaponry, electronic equipment etc. The russians had never cast such large castings for undercarriage legs before the B-29. Neither had they come across so much wiring in an aeroplane before. It singlehandedly changed the Russian aircraft industry; never before had such a big pressurised fuselage been built in the Soviet Union and consequently the technology was utilised by almost every big aircraft builder in the USSR, not least Tupolev, who incorporated B-29 technology in almost every subsequent aircraft design, including the Tu-16 Badger and Tu-95 Bear.
As for the engine, the Cyclone was not reverse engineered; the Russians used the Shvetsov Ash-73TK 18 cylinder radial. The supercharger, magnetos and advanced heat resistant alloys and bearings were copied.
German reverse engineering? I reckon if anything a German DH Mosquito, a proper one, not the Ta 154, but a purpose built high speed multi role aircraft. The Germans could certainly do it.
if they wanted to, perhaps put their own engines in it.
Interesting to note the Russians built a copy of the DH.88 Comet, which was slightly larger than the British machine and not as fast, but in outline it was almost identical; they called it Dyevushkovaya Mashina "Ladies' Machine", since it was largely built by women.