Using the clone troopers from the Star Wars fictional universe isn't a very good comparison or analogy here.
Clones by definition are organisms that were propagated from the same genetic parent/source and are genetically identical, as the clone troopers are.
For DRK to fit the concept of being a clone of WAR, concept since clone/cloning technically has to do with biology, they would have had to do a direct copy and pasting of the code for the WAR job and then name that exact copy DRK; so therefore all the same abilities, game-play loops, etc. Everything would be an exact duplicate, not just have noticeable similarities in some aspects.
The differences that are highlighted in your post between different clone troopers is more akin to different WAR players being at different levels, having different gear and the human players behind the WAR characters having different experience levels and different play-styles and strategies.
So one could argue that all the WARs in the game are clones, seeing as how they are at the most foundational level exactly the same, but saying DRK is a clone of WAR is not factual.
The way that people are using the term "clone", as well as the term "carbon copy", is in a vernacular manner which leans heavily into casual speak's penchant for the hyperbolic, such as in commonly used phrases like "I had the worst day today". Is it literally and factually the "worst" day ever, or even in the speakers lifetime? Very likely not, but it is this vernacular use of hyperbolic and non-literal meaning to this and such words which are a vehicle to convey the speakers feelings on the level of or severity of what they are speaking about.
So when someone says that DRK is a clone or carbon copy of WAR, they are leveraging the use of hyperbole to emphasize what they feel is the severity of how similar the two jobs are, basically trying to convey that they feel that the jobs are "so similar they might as well be clones".
These linguistic flourishes are incredibly common, maybe even to the point of being more common than the definitive and literal usage of words, that seeing or hearing them being used is understandable; however, at the same time they are based in hyperbole and purposefully so.