Compare two different files

I need to compare the difference in contexts or labels stored in brackets in two different files.  

For example:

OLDFILE                                                                           NEWFILE                                                       Result

[AMILX_UATS_DETAIL]                                    [AMILX_UATS_DETAIL]                                     [AMCSmartk__prod_kE]                                                                              
Driver=/mssql/sqls555/S0sql55.so              Driver=/mssql/sqls555/S0sql55.so
Description=DataDirect access Protoc        Description=DataDirect access Protoc

[AMILX_TSTS_DE]                                            [AMILX_TSTS_DE]
Driver=/mssql/sqls555/S0sql55.so              Driver=/mssql/sqls555/S0sql55.so
Description=DataDirect access Protoc       Description=DataDirect access Protoc

[AMCSmartk__prod_kE]
Driver=/mssql/sqls555/S0sql55.so
Description=DataDirect access Protoc


Here is my program:

#!/bin/bash

sdiff OLDFILE.txt  NEWFILE.txt |sed [^ '<']  >Result.out

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