"There is no point in" or "There is not a point in"

I was thinking about these negations. Do these mean the same thing?

There is no point in ...
There is not a point in ...

or:

I have no clue
I do not have any clue

etc.

The difference is in how idiomatic or natural the expressions are, and not in the literal meanings. (I am a native American English speaker; others' intuitions may differ).

There is no point in... (idiomatic and natural)
There isn't any point in... (another natural alternative)
There is not a point in... (marked and unnatural, perhaps emphatic)

I have no clue. (idiomatic and natural)
I haven't got a clue./I don't have a clue. (also natural alternatives)
I do not have any clue. (marked and unnatural, perhaps emphatic)

So we could almost always use the first expressions of each pair that you provided under normal circumstances. But we just as well could use the alternatives I listed instead. Finally, the last listed expressions don't sound right; they might only be used when we want to emphasize.

The meanings are the same, so it's a matter of what will sound natural.