I recently imported a bunch of RAW+JPG images with the “use JPG as original” option and now I realize I should have imported both as separate masters instead.  How can I un-do this?  Or, alternatively, how can I edit the RAW image and compare it to the in-camera JPG?  This was my intent all along.  I have a new camera and trying to evaluate just how good the JPGs are compared with mild tweaks.  Thanks.