Isn't it the other way round? 
When you calibrate a lens with a crop 1.0 camera you have information about the 
distortion inside and outside of the crop 1.5 region of the same lens. So 
fitting of the parameters should be more accurate. 

 When calibration is done with a crop 1.5 image you don't know how the
distortion behaves outside of the image and fitting of parameters at
the border is a guess.

 Am I wrong?

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