Hi,
Yes, you can use the same HW OS upgrade and then install DP.
You have to take into account the steps and make sure you have a backup of the IDB, the worst that can happen is having to import the catalogs of your cartridges, but if you follow the instructions carefully should work, I already did it in some clients and it works.
I've even done a 32 to 64-bit server with different HW.
Regards.