Moderna RNA encodes haemoglobin

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Hi guys.
By running a blast to compare the two sequences it appears that the two sequences have an identical first part while the Moderna vaccine has an extra 585 bases that encode human haemoglobin.
Is this the sequence confirmed to be identical to the one submitted to the FDA or might it be a sequencing or sampling error?
It appears to me that encoding the haemoglobin may produce antibodies that might cause haemo - cardiac issues.