1) Canon uses different marketing names for the same model, for example:
1500D / 2000D / Rebel T7 / Kiss X90 or 450D / Digital Rebel XSi / Kiss X2
For Canons, both model and normalized_model are set based on camera ID, not string specified in EXIF
2) Yes, if pre-LibRaw 0.20 margins was not even, new code will adjust it to even value. In that case, bayer pattern will become the same for full sensor area and for visible area within margins.
I'm not familiar with FITS, so could not help here.
1) Canon uses different marketing names for the same model, for example:
1500D / 2000D / Rebel T7 / Kiss X90 or 450D / Digital Rebel XSi / Kiss X2
For Canons, both model and normalized_model are set based on camera ID, not string specified in EXIF
2) Yes, if pre-LibRaw 0.20 margins was not even, new code will adjust it to even value. In that case, bayer pattern will become the same for full sensor area and for visible area within margins.
I'm not familiar with FITS, so could not help here.