Raw files edited by previous versions of Camera Raw maintain their previous appearance when imported into Lightroom as long as the Camera Raw preference is set to Save Image Settings In Sidecar “.Xmp” Files. To update files edited in Camera Raw after they have been imported into Lightroom, choose Metadata > Read Metadata From Files in the Lightroom Library module. See Synchronize Lightroom metadata with Camera Raw and Adobe Bridge in Lightroom Help.
Additional notes on Camera Raw and Lightroom
Camera Raw reada only the current settings for the primary image in the Lightroom catalog. Virtual copy adjustments and snapshot adjustments are not available in Camera Raw 6.1.