1)Yes, your 2019 filing was accurate.
2) Yes, your 2020 is accurate.
3)No, the 1099-R 2020 with code N will not do anything on your return and you have already entered the recharacterization correctly. The other two 1099-R belong in 2019 because of their codes in box 7 (see more details in answer 4). If any of the 1099-R had taxes withheld you would enter them on your 2020 return to get credit for the taxes paid but they don't therefore you do not have to enter any on your 2020 return.
4) No, since the withdraw of excess contribution did not have any earnings there is no need to amend you 2019 tax return to include Form 1099-R 2020 with the code J and P (if you had earnings they would have been taxable in 2019). Also the 1099-R 2020 with code R belongs on the 2019 return but the code R won't do anything on the return and you reported the recharacterization already correctly.
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