Merge partial .rars d/loaded from torrent with other ones d/loaded with SABnzbd

[Dreamcaster™]

As the subject (possibly the longest subject ever, btw!) says: I am currently re-downloading 70 rar files (100MB each!) whom I had already downloaded using a torrent client.
Is it somehow possible to merge the old files with the new ones I am now getting on usenet, in order to reduce queued data amount?

Thanks.

[inpheaux]

This would require resume capabilities, which we don't presently have, and are hesitant to add. See recent discussion over here.