Pulmonary filled 27/27 spots in the NRMP this year (14 total programs). I wouldn't interpret that as Pulmonary filled 100% of spots and Pulm/Crit only filled 99% (595/601) so Pulmonary is more competitive.
Overall Pulm/Crit is more competitive than Pulm only. A particular Pulmonary program may be more competitive than a particular Pulm/Crit program, but overall the combined training positions are more desired by the majority of applicants.