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Quite often a single Rescue Media build can be used on multiple PCs, but when it doesn't work, it's usually related to drivers or the version of WinPE that was used in the build.
If you just need more drivers, you can manually consolidate the contents of the Drivers folder from Rescue Media builds from multiple PCs onto one. If you need to get those baked into the Boot.wim file, which is necessary for certain drivers, copy your consolidated Drivers folder to C:\Boot\Macrium\Drivers, then on that same PC, run through the Rescue Media wizard and click the Rebuild button at the end, which will update the WIM to include all of them. However, if you need to store drivers intended for multiple WinPE versions, it would probably be easier to do what I'm going to suggest next:
For WinPE issues, some PCs have newer hardware that requires newer versions of WinPE, which is why I normally recommend WinPE 10 regardless of what version of Windows the PC runs. WinPE 10 also works on lots of PCs that don't technically "need" it, but there are some older PCs that only boot older versions, and then there are oddities like some laptops being locked at 640x480 in Rescue only in certain versions of WinPE. So it's certainly possible to have a combination of PCs where no single PE version works everywhere. However, the WinPE version is locked up in that Boot.wim file, so if you wanted needed to store multiple Rescue Media builds on the same flash drive, it's actually easier to just store multiple builds of the entire set of Rescue Media files separately. I do something like this on my own flash drive where I want to keep Rescue Media as well as installers for various versions of Windows. I achieve that by having a folder on the root of my flash drive called "Bootable Environments", and inside that I have various folders, like:
(You would have Rescue Media PC1, Rescue Media PC2, etc.)
Windows 10 1607
Windows 10 1709
Windows 10 Rescue Tools
Each of those folders contains everything that is normally on the root of a drive that would boot those environments. Then when I actually want to boot one of those environments, I cut and paste everything from the desired subfolder onto the root of the drive, thereby making the drive bootable for that environment, and then when I'm done, I cut and paste everything from the root (except the Bootable Environments folder, of course) back to the correct folder. When I want to update my Rescue Media, I run the wizard and have it send the files onto the flash drive, since the Rescue Media wizard does NOT erase the target USB device. The wizard sends the files to the root of the drive of course, and then I just cut and paste everything it placed there into the desired subfolder of "Boot". It works fine.