Is the Roseland Historical Society the same group as the Landmarks & Historic District Commission?
No, they are separate groups, though membership between the Commission and the Society may be similar.
The Roseland Historical Society is a non-profit organization and operates independently from the Borough. If you are looking to contact them, you can email info@roselandhistoricalsociety.org.
The Landmarks & Historic District Commission operates under the auspices of the Borough of Roseland and has its own membership, rules, and guidelines apart from the Historical Society.