If your original files are 1440x1080 HD as I was guessing, and you want only SD PAL/625 as your deliverable (i.e. Standard definition - SD, rather than High Definition - HD) yes you can resize them, preserving the ratio would be 720x576. Then use the same anamorphic button as before, they'll be 16x9 SD. Remember that when you finally output them from your 16:9 FCP session to tape, they will look anamorphic again on SD (aka PAL/625)tape, but will be good for broadcast that way. If you want to output files at the end, make them 16x9 ratio (i.e. 1024x576). Hope I'm helping, and not patronizing!
If your original files are 1440x1080 HD as I was guessing, and you want only SD PAL/625 as your deliverable (i.e. Standard definition - SD, rather than High Definition - HD) yes you can resize them, preserving the ratio would be 720x576. Then use the same anamorphic button as before, they'll be 16x9 SD. Remember that when you finally output them from your 16:9 FCP session to tape, they will look anamorphic again on SD (aka PAL/625)tape, but will be good for broadcast that way. If you want to output files at the end, make them 16x9 ratio (i.e. 1024x576). Hope I'm helping, and not patronizing!