Installing 620 SAP_BASIS Dialog Instance with 6.40 Installation Master CD

Greetings,
At present we have a SAP R/3 Enterprise 47x200 which is dsitributed across two (windows 2003) clustered servers, one for the Central Instance and other for the Database (Oracle 9.2.0.5).
Now and due to perfomance issues on the Central Instance we'd lke to add a Dialog Instance and here is where the doubts come up.
Our SAP_BASIS version is 620 (System -> Status) whereas our SAP Kernel level is 640_REL (SM51).
We have the original 6.20 Kernel CD but we don't have any valid SAP Installation Master CD (originally we made an upgrade from a 4.6B version) so I downloaded from service.sap.com/support the  51033746_13.ZIP (Installation_Master_6.20_6.40_06_08) file (I didn't found any other file better that this one).
The first problem is that when I start sapinst.exe it ask (CD Browser Dialog) for a SAP 6.40 Kernel CD and not the 6.20 Kernel CD I already have. I have found a workaround editing LABEL.ASC file but I think it isn't a good practice.
If I download the Kernel 6.40 from service.sap.com 51030763_1.ZIP (DVD_NW04_SR1_6.40_SAP_Kernel_Oracle) the Sapinst application works perfectly, but here comes up our doubts...
-  Could be any problem using these 6.40 installation (Master Installation & Kernel) files for a Dialog Instance installatio in our environment? Are there other installation files which could fit better than these one? Where could I find them?
-  When I install a Dialog Instance, does it make changes into the Database Server and Central Instance?
- Initially we'd like to install the Dialog Instance in a test Server, try it, check that it works as we expect, and discard it in order to buy a big and powerful server where we'll definitely install the Dialog Instance. In this case, can we simply discard the test server or we have to follow a complex process for uninstall it?  (this question is somehow related to the previous one).
Any help would be greatly appreciated. Thanks in advance.
Javier

Hi,
it is OK that you have 640 kernel even if your BASIS is 620. 620 kernel is no longer supported by SAP.
- Could be any problem using these 6.40 installation (Master Installation & Kernel) files for a Dialog Instance installatio in our environment? Are there other installation files which could fit better than these one? Where could I find them?
You master DVD is correct
- When I install a Dialog Instance, does it make changes into the Database Server and Central Instance?
It does not make any changes to DB, you will see next Dialog instance in SM51 then
- Initially we'd like to install the Dialog Instance in a test Server, try it, check that it works as we expect, and discard it in order to buy a big and powerful server where we'll definitely install the Dialog Instance. In this case, can we simply discard the test server or we have to follow a complex process for uninstall it? (this question is somehow related to the previous one).
You can discard your dialog instance without following special procedures.

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