84-074N vs 84-074?

A quick learner from I think 84-074N but ... 84-074 (?) says:
Is there a functional difference between the 84-074N and 84-074?

I am replacing rollers for our patio sliding screen door the 84-074N measures exact but so does the 084...
wondering why 2 parts appear identical ?

what is the difference between the two parts?

thanks very much!
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Paul from SWISCO responded:
The difference between these two parts is the material of the wheel. The 84-074 uses a steel ball bearing concave wheel, while the 84-074N uses a nylon ball bearing concave wheel.
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