Backup & Recovery :: Migrating Databases / Task To Migrate Total Databases

I have the task to migrate the total databases(Exact copy to be moved to another server).The current server is going for format.After I did the following steps I am getting the tablespaces(databases)-4 sizes same ,but I am facing issue like some default tablespaces i.e temp,system are not matching.

temp tablespace
***************
current server - 4.0(approximately)
Migrating server - 160 MB

System tablespace
*****************
current server - 580 MB
Migrating server - 220 MB

Also I checked the tables are also matching for the 4 databases.Also Provide the solution or method which is correct.

steps done for migrating(By me)
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EXPORTING DATA USING DATAPUMP
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1 From command prompt MKDIR 'c:oraclexeapp mp';

2 From SQL prompt conn system/kotak;

3 create or replace directory dmpdir as 'c:oraclexeapp mp';

4 grant read,write on directory dmpdir to kotak;

5 From command prompt

expdp system/kotak@xe full=Y directory=dmpdir dumpfile=xe.dmp logfile=expdpxe.log;
IMPORTING DATA USING DATAPUMP
*****************************
in another server machine

1 From SQL prompt conn system/kotak;

2 create or replace directory dmpdir as 'c:oraclexeapp mp';

3 grant read,write on directory dmpdir to kotak;

4 From command prompt set ORACLE_SID=xe;

5 impdp system/kotak@xe full=Y directory=dmpdir dumpfile=xe.dmp logfile=impdpxe.log;

IN OUR PROCESS we created the below tablespaces and user before IMPORTING created 4 tablespaces

1. kotak
2. kotakdb
3. wired_data
4. ferrari

Created Users which are there in 219 server
1. KOTAK
2. KOTAKDB
3. FC_80
4. DEMOINTERNETBANK
5. DEMOINTERNETBANKDB
6. CREDITCARD