|The recovery disk should work on identical computers. The recovery set encompasses both the hardware drivers and all the original software. |
So, if a model has different hardware or came with different software then it may work or it may not. If it works at all you may need to install some additional drivers and some software may end up differently.
I suggest you make ALL the recovery sets as time permits. When disposing of the computers they are more valuable with those disks included. Mark the disks with the service tag or some other ID so you know for sure which computers use which disks.
If you have many of the same then just make a notation in the records of which computers had the restore set created and which didn't. Of course, make sure you have a couple of sets available for each configuration.
You should also slipstream the latest service pack and updates into the master disks you will occasionally use to restore all the same models.
nLiteOS is one utility that is easy to use for slip streaming.