in the case of Evil-Merodach there is ambiguity as to the length of his reign whether it was two years or eighteen years
Here's a bit of evidence I'll throw out there:
NBC 4897 is an ancient "spreadsheet" that a shepherd in Uruk used to keep track of the annual growth of his sheep and goats, for ten consecutive years. The first year on this document is the 37th year of Nebuchadnezzar.
As Scholar would agree with, the growth figures for the flock dated to the accession year of Evil-Merodach come right after the records dated to the 43rd year of Nebuchadnezzar.
But then...the growth records dated to the accession year of Neriglissar come right after the records dated to 2nd year of Evil-Merodach. The last record is dated to the first year of Neriglissar. It's no wonder that Insight mentions that all discovered records for Evil-Merodach date only up to his 2nd year.
Now let's look at the reign of Amasis of Egypt.
We know from Egyptian chronology that Amasis reigned for 44 years, and that his successor, Psammatichus III (Psamtik III), was conquered at the end of his first year by Cambyses of Persia...in 525 BCE.
The Babylonian Royal inscription, BM33041, dated to Nebuchadnezzar's 37 year, describes a Babylonian military campaign against Amasis of Egypt.
582 BCE, Scholar's last (43rd) year for Nebuchadnezzar, would precede the beginning of Amasis' reign by twelve years.
Amasis' reign and it's tie-ins to Babylonian chronology don't allow for a twenty year gap...unless you start claiming that Egyptian Chronology also contains a twenty year gap that perfectly corresponds with the Babylonian one.
*** it-1 p. 560 Cush ***
Persian King Cambyses II (529-522 B.C.E.) conquered Egypt during the days of Pharaoh Psamtik III, and this opened the way for bringing Ethiopia under Persian control; thus, Ahasuerus (Xerxes I) could be spoken of as ruling "from India to Ethiopia [Cush]." (Es 1:1; 8:9) Confirming this, Xerxes states in an inscription: "These are the countries—in addition to Persia—over which I am king . . . India . . . (and) Kush."—Ancient Near Eastern Texts, p. 316.