Scientists cannot ascribe a "law of physics" to a universe other than their own host universe.

Assuming there is a law of physics for any universe disparate from your own is a lofty proposition. A "law of physics" requires rather "arbitrary" physical properties, such as weights and measures. For example: Would a...thing...in universe without an analog for what we know as "gravity" have weight? Also, in a universe that has no Higgs proposition, would there be an analog for a cosmic speed limit, such as c?

It would be therefore unreasonable to assume that a discrete universe other than our own would even be traversable, much less, detectable or measurable.