I expect so. Japanese experience with the B-20s ought to give Boeing designers a good deal of feedback in designing the Superfortress. Also, that certain city would be a most logical home base indeed.
I have to know, what was the actual reasoning behind swapping the engines? As far as I can tell the Wasp Junior SC-G is broadly similar to the Aquila and neither of them got developed any further so it can't be 'concerns about lack of development'. Given the improvement managed with the Aquila's sister engine (the Perseus) Bristol clearly could have made it better over the years, but as no-one wanted it there was no reason. Doubtless P&W could have made the Wasp Junior even better, but no-one wanted a high power version they just wanted lots of cheap and cheerful engines for trainers and transports.
The only real difference I can see is that the Bristol engine has sleeve valves, which mean it's lighter but more complex for maintenance, and there's also more potential for improvement crossing over from the other Bristol sleeve valve engines. And of course the big difference; as the Venom was designed for the Aquila swapping engines will take time and money re-designing the aircraft (the SG-C is a similar size but is heavier so will need stronger mounts). If your being overly detailed there may even be slightly worse performance, though I'm not sure the extra 100lb or so of the P&W engine would be that significant in a 4000lb odd aircraft.
In summary; why?
That aside an interesting selection of aircraft the Japanese have, though I do wonder if they might have trouble supporting their odd-ball fleet in the future. I'm not sure how possible it was to 'localise' an aircraft at the time, but it's something I'd be seriously looking at if I was Japan, you don't want to be dependant on a spare parts factory on a different continent when war starts. As some of those aircraft have some clever components (the sodium cooled exhausts on the B-20s engines for instance) this may require some quite serious local investment.