Update: The first difference isn't quite as significant as first thought; it's all about the Hide SQL/Show SQL button :)
The 126.96.36.1991 Plan Viewer displays similar plans differently depending on how the plans were requested.
The following images were captured from two plans for more-or-less the same query. The "meat" of the plans are essentially identical; this posting is about GUI differences.
Here are the differences...
The first image is of a plan captured via the following call to GRAPHICAL_PLAN()...
SET @plan = GRAPHICAL_PLAN ( ' SELECT TOP 1 rroad_sample_set.sample_set_number FROM rroad_sample_set INNER JOIN rroad_group_2_property_pivot ON rroad_group_2_property_pivot.sample_set_number = rroad_sample_set.sample_set_number WHERE rroad_group_2_property_pivot.connection_id_string = @connection_id_string AND rroad_sample_set.sample_started_at <= DATEADD ( MONTH, -1, @sample_finished_at ) ORDER BY rroad_sample_set.sample_started_at DESC; ', 2, -- Detailed statistics including node statistics 'asensitive', 'READ-ONLY' );
The second image is of a plan for a query run in ISQL.