With a few exceptions (such as the magazine release), the 948 was basically the .22lr version of the Model 1934 (.380)/1935 (.32) but with an alloy frame. I'm fairly certain that Jaguar magazines would not work. Check the Triple K company site: http://www.triplek.com/Products/id/38/grp/412/prd/454/ for repro magazines. Finding factory originals is going to be tough.
Welcome to the forum, by the way!