(Those are the same thing)
Meaning, that's HOW you attempt to falsify something. Which is really all the scientific method is.
Every fossil we dig up tests the theory. Every genetic test. Every description of physiology of any species, extant or extinct. Every time we find a new species, the theory is tested.
Well your post said that evolution could be falsified by "Mammal fossils found in the Cambrian" which while true is - IMHO - misleading, it seems to imply that unless we find some "thing", the evolution hypothesis stands. But the Cambrian is falsified not by what is found but by what isn't found.
For evolution to be a true explanation for the Cambrian, then each of the many phyla must have had ancestors in common at some point in the past. Consider the phylum
Arthropoda and its origins:
It has been proposed that the Ediacaran animals Parvancorina and Spriggina, from around 555 million years ago, were arthropods, but later study shows that their affinities of being origin of arthropods are not reliable. Small arthropods with bivalve-like shells have been found in Early Cambrian fossil beds dating 541 to 539 million years ago in China and Australia. The earliest Cambrian trilobite fossils are about 520 million years old, but the class was already quite diverse and worldwide, suggesting that they had been around for quite some time.
This is one of the problems in the Cambrian, we find multiple variants of a phylum, richly developed complex animals in many cases, but we find no ancestors, like Trilobites (an arthropod), there are many of those, fossils all over the place but although we find a multitude of variant Trilobites we never find evidence of long ancestral presence.
The evidence of the fossil record is that complex animals containing a vast array of already evolved biological features, just appear out of nowhere, this is why they call it an "explosion" it is the antithesis of gradual of continuous, it is characterized by
discontinuity.
Remember almost all phyla we see today can be traced to the Cambrian, the first "versions" of each phyla just appear in the record, fully developed, differing markedly from other phyla, a highly diversified fossil array with no trace of common ancestral fossils and no credible explanation for that absence.