comparison of Shinyei PPD42NJ and PPD42NS sensor

I am a school teacher who is working on an air quality measurement project. I have instructions for building a sensor to measure particles.

The instructions require the PPD42NS sensor from the Shinyei corporation. That model is no longer made by the company. They do sell the PPD42NJ model.

Are these two sensors interchangeable? Thanks in advance.

The data for both sensor is identical, so it seems to be a drop in replacement, not sure if there is any difference.