Can rpm's be replaced like this?

[senrooy]

I have two rpm packages:
1)ns-2.0.0.0-0.dl.web.rpm.bin
2)ns-2.0.0.0-0.dl.rcd.rpm.bin
If I install ns-2.0.0.0-0.dl.web.rpm.bin it installs succesfully and after that if I install this ns-2.0.0.0-0.dl.rcd.rpm.bin this also installs successfuly
When I do a rpm -qa | grep ns
It shows both the packages
I want to have an over installation . How do I prevent the existence of both the packages?

[Rubberman]

In a case like this, you need to remove the older package. In some cases, you will need to remove them both and then reinstall the newer one. Since these are executables that install an internally-contained rpm, running rpm with the update command likely won't work to update. So, in the future, remove the old package first, then run the new package installation script.