Screen Replacement - Fitting the square peg in a round hole?

I just got a replacement screen for my 20 Ultra and there's been some weird fitment issues and parts on my original phone which look like they were hand-machined. This part labeled M has a square slot on my original chassis and it's round on the new one.

Do I have the wrong replacement here? Can I move the new screen to the old chassis instead?

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Update (01/06/24)

Comparing the two side by side, I'm starting to think this is a base Note 20 5g body and not the Ultra.

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Comparing the two side by side, I'm starting to think this is a base Note 20 5g body and not the Ultra.

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@gregorygrande probably wrong model, model number usually has a letter at the end like f or u etc

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