Multiple Database Delegation.

Hi,

One of our client has 2 databases for 2 different operating companies.
Here we have the architecture of 3 tiers on 3 machines.

setup scenario is:
clustered SQL Db : Both databases will be on the same clustered enivironment.
NAV server machine 1: NAV server for 1st DB
NAV server machine 2: NAV server for 2nd DB

here all of these services will be running with same domain USER ID.

The thing is, when we did installation of first, there were no issues in setting up the delegations to user running the services.
now for installing another database, we have a issue in setting up the delegation.

for clustered environment, there will be 4SPNs required.
DynamicsNAV/<machine-name>:7046
DynamicsNAV/<Fully Qualified Domain Name machine-name>:7046
MSSQLSvc/<machine-name>:1433
MSSQLSvc/< Fully Qualified Domain Name machine-name>:1433

not in out case,
there should be total 8 SPNs
but as SQL system is same
there will be total 6 SPNs.

1.Will this work?
2.Same user running all services, so setting up these SPNs for user delegation.
this is not working.
3.can i have the same Service name as Dynamics NAV and same port noumber 7046 for both the NAV servers?

if anybody has done something like this,
please suggest a proper way to do it... #-o

Thanks,
Ganesh.