The change to "Son of God" was made long before 1769 in several editions of the KJV although a few KJV editions still have "son of God" after 1769.
Daniel 3:25 [see Dan. 4:8]
son of God (1675, 1681, 1720, 1737, 1758, 1774, 1784, 1788 Oxford) [1629, 1635, 1637, 1638, 1683, 1761, 1768, 1783 Cambridge] {1611, 1640, 1657, 1698, 1703, 1706, 1730, 1741, 1795, 1827, 1828 London} (1638, 1715, 1735, 1751, 1760, 1766, 1769, 1791, 1793 Edinburgh) (1762 Dublin) (1645 Dutch) (1700 MP) (1746 Leipzig) (1782 Aitken) (1792 Brown) (1799 Helston) (1802 Carey) (1804 MH) (1809 Boston) (1843 AFBS) (1853, 1854, 1855, 1858 ABS) (CB) (2024 FGWB) (1833 WEB)
Son of God (1679, 1709, 1754, 1768, 1769 Oxford, SRB) [1648, 1760, 1762, 1763B, 1765, 1769, 1775, 1792, 1812, 1816, 1817, 2005, 2011 Cambridge, DKJB] {1613, 1614, 1616, 1630, 1631, 1655, 1660, 1743, 1759, 1760, 1764, 1768, 1772, 1811, 1813, 1820, 1824, 1838, 1853, 1879, 1976 London} (1782, 1801, 1809 Dublin) (1776 Birmingham) (1790 Bolton) (1810 Woodward) (1818, 1819, 1827, 1829, 1843, 1851, 1868, 1888, 1894, 1902, 1954, 1956, 1957, 1971, 1984, 1988, 2004, 2008 ABS) (1821 Brown) (1824, 1826 Bagster) (1850 AFBS) (1868 RTS) (1957, 1964, 2007, 2022 TCRB) (1959 Little) (1961, 1975, 1978, 2008 GID) (1972 NMRB) (1974 MBI) (1976 OGH) (1976 TBR) (WMCRB) (1984 MME) (1987 IBS) (LASB) (KJRLB) (1989, 1991 World) (1991, 2012 FWP) (1996 ELKJV) (2000, 2019p Holman) (2000 Rainbow) (2002, 2010 KJVER) (EB) (RSB) (CNB) (2008, 2012 ROASB) (ASB) (2009 Ruckman) (2011 KJVDB) (2012 Biblica) (2012 WSB) (2013 CC) (2013 HMB) (2013, 2014 TGS) (2014 RHKJVSB) (2014 TSB) (2015 KJVFSB) (2015 KAPPA) (2017 KWSB) (2018 Spurgeon) (2022 SB)