Highlighting Values In Column to Column Comparison using VBA - excel

Question

I am attempting to compare two columns in two separate sheets, each column contains data that is a string. My issue is that there is data in one column that is identical to the other in separate rows; therefore I have to check the entire column for the data before moving to the next. I am very inexperienced with VBA and am trying to make one portion of my job easier rather than comparing the columns by hand. I have piece wised the following code from research and trial and error. I am able to get the entire Column searched in my first Sheet, but only one value is being highlighted on the second sheet and then it is returning a value of "True" in the first column. I am unsure where I have gone wrong, any help is greatly appreciated!
Sub Better_Work_This_Time()
Dim FindString As String
Dim Rng As Range
ActiveCell = Sheets("Last Week").Range("A2").Activate
FindString = ActiveCell
Dim County As Integer
Count = Cells.CurrentRegion.rows.Count
For i = 2 To County
If Trim(FindString) <> "" Then
With Sheets("Current Week").Range("A:A")
Set Rng = .Find(What:=FindString, After:=.Cells(.Cells.Count), LookIn:=xlValues, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, MatchCase:=True)
If Not Rng Is Nothing Then
ActiveCell.Font.Color = vbBlue
End If
End With
End If
If IsEmpty(FindString) Then
FindString = False
End If
ActiveCell.Offset(1, 0).Select
i = i + 1
Next
End Sub

Answer 1

Without using ActiveCell and using Match instead of Find.
Option Explicit
Sub Does_Work_This_Time()
Dim wb As Workbook, wsLast As Worksheet, wsCurrent As Worksheet
Dim FindString As String, ar, v
Dim LastRow As Long, i As Long, n As Long
Set wb = ThisWorkbook
' put current week values into array
Set wsCurrent = wb.Sheets("Current Week")
With wsCurrent
LastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
ar = .Range("A2:A" & LastRow).Value2
End With
' scan last week matching current week
Set wsLast = wb.Sheets("Last Week")
With wsLast
.Columns(1).Interior.Color = xlNone
LastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
For i = 2 To LastRow
FindString = Trim(.Cells(i, "A"))
If Len(FindString) > 0 Then
v = Application.Match(FindString, ar, 0)
If IsError(v) Then
'no match
ElseIf ar(v, 1) = FindString Then ' case match
.Cells(i, "A").Interior.Color = RGB(128, 255, 128) ' light green
n = n + 1
End If
End If
Next
End With
MsgBox n & " rows matched"
End Sub