What is The Difference Between PCASTL And M, Programming Languages

Both PCASTL and M are Interpreted Programming Languages
What are Interpreted Programming Languages
An interpreted language is a programming language for which most of its implementations execute instructions directly, without previously compiling a program into machine-language instructions. The interpreter executes the program directly, translating each statement into a sequence of one or more subroutines already compiled into machine code. (Wikipedia)
Since PCASTL and, are both Interpreted Programming Languages
Let us now look at the difference between the two:
What is PCASTL Programming Language – A brief synopsis
An acronym for by Parent and Childset Accessible Syntax Tree Language, it is a high-level language developed by Philippe Choquette and falls under the class of interpreted computer programming languages. It is specially designed for self-modifying code.
What is M Programming Language – A brief synopsis
M is short for MUMPS, a programming language created for the health care industry. Neil Pappalardo, the founder of medical information technology and his associates developed the M language.
Sources
A Complete List of Computer Programming Languages