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Not that i am aware of, and now we know what you're after we can easily point you in the right direction: Get another PC!
Having two machines controlled by the same PC is not safe as any issue with the PC would stop both machines, together with the materials scraped that may or may not be recoverable.
If space is the issue, most monitors have at least two inputs, some can show both inputs at the same time, some also have KVM so connecting mouse/keyboard to monitor will switch those whenever you switch monitor inputs.
Keep in mind having two PC's on the same monitor without a KVM has the inherit drawback of clicking on keyboard/mouse several times till it dawns it's the wrong PC on. Done this a lot as i have a monitor in the shop with 7 inputs and usually 2-5 PC's connected.
What about using laptops? There are several i tested that work OK for normal "non mission critical" use:
forum.linuxcnc.org/18-computer/54369-use...mesa-ethernet-boards

You need to be clearer please, loose terminology is confusing things.

You are using "machine" to mean multiple things.

Suggest:
Computer (the hardware linuxcnc runs one)
CNC machines

> as long as you do not need both running at the same time.

Exactly that's what I wanted.

Is there any workaround that could work, too, without having to use two separate machines?