1918 flu and Swine flu, the same (infections, viruses, disease, cause)

[Brian.Pearson]

...research supports the hypothesis that the 1918 pandemic influenza virus and the virus causing the swine flu were the same. Richt said the virus was able to infect and replicate in swine and cause mild respiratory disease. The 1918 virus spread through the pig population, adapted to the swine and resulted in the current lineage of the H1N1 swine influenza viruses.

The main difference has to do with the earlier lack of antibiotics for secondary infections.

[Kaye02]

In the CNN reports it said that this swine flu is different because lacked the ability to transmit from person to person as easily. I wonder which is true.