Here are two links to This Week In Perfect Team where rare cards are discussed:
For 20:
https://youtu.be/l0UQ5jsiLXA?t=1215
For 19:
https://youtu.be/gz1adl2lGXc?t=726
Kris does specifically mention that the pulls are equal for the different card categories (ie a Legend has the same chance to be pulled as an All Star). Nothing is mentioned here about card pulls being affected by overall ratings. However, the 5 rarest cards in 20 were all between 95 and 98 OVR, while all but 3 of the 15 rarest cards in 19 were between 96 and 98 OVR, with the outliers being 2 historic perfects and 1 random 92 OVR card.
This is all that a very brief search returned on the subject, so more information may well be out there.
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