GMAT Official Practice Questions and OG 2021 contain different set of questions that don't overlap each other.
If you want to, buy the latest GMAT Official Practice Question #2, which supposedly contains the LATEST retired, real exam questions. On the other hand, OG2020 provides you with 1000+ retired, real exam questions.
I supposed the scratch code for OG 2020 is not able to port over to my GMAT profile at MBA website?
I don't have the answer to this, but perhaps this is not an important issue. Both gmat wiley and mba.com are the official, gold standards of your gmat practice questions.
Would GMAT Wiley website be able to provide an analysis of the questions that I have answered, like that MBA website is providing?
Gmat wiley contains answer explanations for each question. I don't think it gives a detailed (performance) analysis of your costum-made practice
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