@echo off
setlocal EnableExtensions DisableDelayedExpansion

rem // Define constants here:
set "_ROOT=%~dp0." & rem // (common root directory; `%~dp0.` is script's parent, `.` is current)
set "_DIR1=%_ROOT%Directory1" & rem // (1st directory containing files)
set "_DIR2=%_ROOT%Directory2" & rem // (2nd directory containing files)
set _MASKS="*INV*." "*SLS*."     & rem // (list of quoted file masks)
set "_TMP1=%TEMP%%~n0_1_%RANDOM%.tmp" & rem // (1st temporary file)
set "_TMP2=%TEMP%%~n0_2_%RANDOM%.tmp" & rem // (2nd temporary file)

rem // Resolve 1st directory to be an absolute path:
for %%E in ("%_DIR1%") do set "RDIR1=%%~fE"
rem // Resolve 2nd directory to be an absolute path:
for %%E in ("%_DIR2%") do set "RDIR2=%%~fE"

rem // Write all matching files in 1st directory to 1st temporary file:
pushd "%RDIR1%" && (
    for %%F in (%_MASKS%) do (
        echo(%%~nxF
    )
    popd
) > "%_TMP1%"
rem // Write all matching files in 2nd directory to 2nd temporary file:
pushd "%RDIR2%" && (
    for %%F in (%_MASKS%) do (
        echo(%%~nxF
    )
    popd
) > "%_TMP2%"

rem // Loop over all common files from both temporary files:
for /F %%L in ('findstr /L /I /X /G:"%_TMP1%" "%_TMP2%"') do (
    rem // Build absolute `wmic`-compatible file paths:
    set "FILE1=%RDIR1:=\%\%%L" & set "FILE2=%RDIR2:=\%\%%L"
    setlocal EnableDelayedExpansion
    rem set "FILE1=%!FILE1:&=&!" & set "FILE2=%!FILE2:&=&!"
    rem // Get standardised file date/time (last modification) of 1st file by `wmic`:
    for /F %%K in ('wmic DataFile where "Name='!FILE1!'" get LastModified') do set "DATE1=%%K"
    rem // Get standardised file date/time (last modification) of 2nd file by `wmic`:
    for /F %%K in ('wmic DataFile where "Name='!FILE2!'" get LastModified') do set "DATE2=%%K"
    rem // Compare file dates/times (last mod.) of both files and return differing ones:
 @echo on
if !DATE1! gtr !DATE2! echo "!FILE1:\=!" is newer than "!FILE2:\=!"
if !DATE1! lss !DATE2! echo "!FILE1:\=!" is older than "!FILE2:\=!"
if !DATE1! equ !DATE2! echo "!FILE1:\=!" is same with  "!FILE2:\=!"

    endlocal
)

rem // Clean up temporary files:
del "%_TMP1%" "%_TMP2%"

endlocal
exit /B

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:Usersksaycon>cd Desktop

C:UsersksayconDesktop>sample.bat
"C:UsersksayconDesktopDirectory1FFPDFINV06" is same with  "C:Usersksaycon
DesktopDirectory2FFPDFINV06"

C:UsersksayconDesktop>(
rem // Build absolute `wmic`-compatible file paths:
 set "FILE1=C:\Users\ksaycon\Desktop\Directory1\FFPDFSLS02"   & set "FILE2=
C:\Users\ksaycon\Desktop\Directory2\FFPDFSLS02"
 setlocal EnableDelayedExpansion
 rem set "FILE1=&=&!" & set "FILE2=&=&!"
 rem // Get standardised file date/time (last modification) of 1st file by `wmic
`:
 for /F %K in ('wmic DataFile where "Name='!FILE1!'" get LastModified') do set "
DATE1=%K"
 rem // Get standardised file date/time (last modification) of 2nd file by `wmic
`:
 for /F %K in ('wmic DataFile where "Name='!FILE2!'" get LastModified') do set "
DATE2=%K"
 rem // Compare file dates/times (last mod.) of both files and return differing
ones:

 if !DATE1! GTR !DATE2! echo "!FILE1:\=!" is newer than "!FILE2:\=!"
 if !DATE1! LSS !DATE2! echo "!FILE1:\=!" is older than "!FILE2:\=!"
 if !DATE1! EQU !DATE2! echo "!FILE1:\=!" is same with  "!FILE2:\=!"
 endlocal
)

C:UsersksayconDesktop>set "DATE1=LastModified"

C:UsersksayconDesktop>set "DATE1=20190318040549.218407+480"

" UsersksayconDesktop>set "DATE1=

C:UsersksayconDesktop>set "DATE2=LastModified"

C:UsersksayconDesktop>set "DATE2=20190318095134.760320+480"

" UsersksayconDesktop>set "DATE2=
"C:UsersksayconDesktopDirectory1FFPDFSLS02" is same with  "C:Usersksaycon
DesktopDirectory2FFPDFSLS02"

C:UsersksayconDesktop>rem // Clean up temporary files:

C:UsersksayconDesktop>del "C:UsersksayconAppDataLocalTempsample_1_13650
.tmp" "C:UsersksayconAppDataLocalTempsample_2_27021.tmp"

C:UsersksayconDesktop>endlocal

C:UsersksayconDesktop>exit /B

C:UsersksayconDesktop>^A