Well they do not really share that much given none of the OS/2 that shipped were based on NT, although that was the plan at the beginning of the dev of NT, and

Well they do not really share that much given none of the OS/2 that shipped were based on NT, although that was the plan at the beginning of the dev of NT, and first versions of NT had a (quite limited) OS/2 subsystem. So there may have been some influences, but the target "quickly" switched to Win32 anyway.