An alternate source, "Statistics of the Congressional and Presidential Election of November 7, 1944" as reported by the Office of the Clerk of the U.S. House, reports different vote totals for Myers and Davis - 1,864,622 and 1,840,938 respectively.
Source for Popular Vote data: Pennsylvania Department of General Services. The Pennsylvania Manual, Pennsylvania Department of General Services (http://staffweb.wilkes.edu/harold.cox/sen/PaSen1944.html) (accessed 15 May 2018)