Google revealed a definition of 'Fact Pattern/Situation' (abbreviate to FP)
A concise description of all the occurrences or circumstances of a particular case, without any discussion of their consequences under the law. The fact situation, sometimes referred to as a fact pattern [bold mine], is a summary of what took place in a case for which relief is sought. The fact situation of one case is almost always distinguishable from that of another case.
When one case with a particular fact situation has been decided, an attorney may use it as precedent and relate it to another similar case on which he or she is currently working.
but nothing for "Factual matrix", except its use in Canada and England & Wales.
So what's the definition of Factual Matrix (abbreviate to FM)?
Please contrast and compare FM and FP?