I know they are the same--have done a lot of research on this family, and spent a lot of time in Sandisfield. It took me a long time to be sure but finally had definitive proof. "Jr" was used differently in those days than it is now. His son Richard with Grace also became Jr.
I have tons of deeds, wills, tombstone photos, etc for this Richard Chapel. I am descended from his 2nd wife, Sarah Smith, and their son Mathew Smith Chapel. Could send you my transcription document if interested.