Are H-IIA fairings compatible with Delta IV 4-meter second stage?

• Are H-IIA fairings compatible with Delta IV 4-meter second stage? by ZachS09 on 13 Mar, 2022 13:42
• I was looking up the Delta IV Medium and H-IIA rockets and saw their respective fairings are 4 meters in diameter. The fairings also vary in mass with the Delta IV Medium's being way heavier.
  
  H-IIA: 1,400 kg
  Delta IV Medium: 2,800 kg
  
  (Source: www.spaceflight101.com)
  
  My question is: could the lighter H-IIA fairing have fitted on the 4-meter Delta IV second stage? If not, why?
• #1 by Jim on 13 Mar, 2022 13:50
• not enough info to make a determination.  Does the H-IIA use a PAF and total encapsulation.  Is the PAF interface the same dimensions and bolt hole pattern as the Delta IV ?
• #2 by ZachS09 on 13 Mar, 2022 14:31
• I made a comparison photo of both fairings, using their respective launch user's guides as sources.
  
  Edit: Added comparison photo of both payload adapters.

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