Sorry to be pedantic, but those camera CCD chips are not the same size.
QHY8L has a 25.1mm x 17.64mm chip, with 7.8 micron pixels and an array of 3032 x 2016 pixels.
QHY9 has a 17.9mm x 13.5mm chip, with 5.4 micron pixels and an array of 3358 x 2536 pixels.
So you will be limited by the FOV of the QHY9.
Cheers
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