Using PowerShell, identify the last TWO most recently created files in a single directory, compare them, and spit out only the differences to a file - windows

Question

I need some assistance on my attempt at my 3rd PowerShell script. I have a report being generated daily. It puts the information I need into a txt file in a Reports folder on my desktop. I'm needing a way to compare the most recent LAST report with the newest and then output the differences to a different file for review at a later date. This script will run as a .bat on every computer getting these reports (obviously only running if the computer is turned on so the dates will not always be back to back).
There will only be a single write to this directory every 24 hours which will be the daily generated report. The daily report file is named with the computer name in file name aa111111-report-currentdate.txt. If the 'Report' directory contains 2 or more files, run a compare on the most recently created file and the previously created file then spit out the differences to a new file in a different directory to identify new changes manually. Here is what I have:
if ((Get-ChildItem C:\users\x\Desktop\Report -File | Measure-Object).count -ge 2) {
Compare-Object (Get-ChildItem 'C:\users\x\Desktop\Report' | sort LastWriteTime | select -Last 1) -DifferenceObject (Get-ChildItem 'C:\users\x\Desktop\Report' | sort LastWriteTime | select -Last 2) -PassThru | Where-Object {$_.Name -match '^[a-zA-Z]{2}\d{6}[-]report[-]\d{4}[-]\d{2}[-]\d{2}\.txt$' -and $_.SideIndicator -eq "=>"} | Out-File -FilePath 'C:\users\x\Desktop\Report_Differences\differences.txt' -Width 9999999
}
(Get-ChildItem 'C:\users\x\Desktop\Report' | sort LastWriteTime | select -Last 1) looks like this:
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 5/23/2020 8:45 PM 670146 DESKTOP-aa111111-report-2020-05-23.txt
(Get-ChildItem 'C:\users\x\Desktop\Report' | sort LastWriteTime | select -Last 2) looks like this:
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 5/23/2020 8:45 PM 670146 DESKTOP-aa111111-report-2020-05-23.txt
-a---- 5/24/2020 9:45 PM 793676 DESKTOP-aa222222-report-2020-05-24.txt
Problem 1:
My current solution seems to identify both files as a single query and I'm not sure how to have PowerShell understand I need them identified separately to do a diff. How can I specify a compare on only the 2 most recently created files in the directory, diff them, then spit out results to another file in a separate directory WITHOUT knowing the exact file name (only the regex pattern which will match).
Extra: Is there a method to get the difference file to be formatted such as 'date of last file vs date of today' so I know which files/dates found the differences?
UPDATE
$last2createdfiles = Get-ChildItem 'C:\users\x\Desktop\Report' | sort LastWriteTime | select -Last 2
However, the below PowerShell does not output the file differences to a file. It only shows the output of the file name properties of $last2createdfiles[0] such as mode, lastwritetime,length, and name.
if ((Get-ChildItem C:\users\x\Desktop\Report -File | Measure-Object).count -ge 2) {
Compare-Object -ReferenceObject $last2createdfiles[0] -DifferenceObject $last2createdfiles[1] -PassThru | Where-Object {$_.SideIndicator -eq "=>"} | Out-File -FilePath 'C:\users\x\Desktop\Report_Differences\differences.txt'
}
What am I missing?