My personal bible on the subject, "British Military Serials" by Robertson lists:
EW341 to EW610 Cornell
EW611 to EW634 Liberator
EW635 to EW873 no entry
EW874 to EW972 Hudson, 42-6582 to -6681
Baugher's web site confirms the US serials/RAF serials match up for the EW874 + up Hudsons. The other serials you mention, 41-23223 and up, had serials allocated in the
BW361 and up range, but were diverted to various other destinations, including Australia.
This web site matches Robertson, but I think they based all their early info on that book:
http://www.ukserials.com/