John Shimkus actually said...

The goal of this discussion draft is to add greater certainty to the New Source Review permitting process.

The fact that the New Source Review program can be a barrier to projects that would result in better air quality is unacceptable.

In order to provide more certainty to the NSR program, the discussion draft takes the hourly rate test used by the NSPS program.

Well, it seems to me that if Congress wanted the definition to be different it would have provided a separate definition for each program.