BO System Restore : CMS PORT

Hi,

We want copy BO system to system A to System B.

1.BO 4.0 SP4 is already installed on system A
    SIA Node name: XYZ
    SIA Port     : 6410
    CMS Port     : 6400

2.We have installed BO 4.0 SP4 system on System B
    SIA Node name:XYZ
    SIA Port     :6410
    CMS Port     :6400

We want to keep same CMS port as we don`t want to change the configuration.

Question: When we recreate Node, we have to select Start a new temporary CMS with Free port
  ( other than 6400 ).
So will our CMS have port 6400 after restore?
Is it better idea to install BO on system B with same ports as that of System A ?

Best Regards,

Vinay.