[dosprog]

Then, as I understand, your program is working fine
- it determines that the bytes of the actual function server
do not match the bytes in the tracked DLL in the system32 directory
?

..
You can previouosly import target function to your program and make alias-table
like this:
;-------------------------------------------------------[ASM]
ECU_TABLE_ITEM STRUC
RealAddress dd ? ;;Real address
TargetFunctionName db 30h dup (?), 0 ;;Function name
ECU_TABLE_ITEM ENDS

imp_equ_table:
imp1 ECU_TABLE_ITEM <?, 'ShowWindow'>
imp2 ECU_TABLE_ITEM <?, 'GetModuleHandle'>
.....etc.
;-------------------------------------------------------[ASM]

- Further work referring to this table.



--add--

PE-loader at new versions of OS can emulate imported function without original dll
(For example, kernel32.dll may be absent, but application with call of kernel32.GetModuleHandleA will work fine)