Oxford/Astrazeneca, Sinovac, and Sputnik all use the same technology (I'm not sure why the chart uses different words to describe them). Sputnik uses two different adenoviruses to avoid the body's immune response to the first adenovirus spoiling the immune response to the payload on the second dose; Oxford doesn't (and may be less effective as a result). This is irrelevant for J&J because it's one dose.