Learn English – What does “nine while nine” mean

The classic proverb holds that, "There is honor among thieves.”¹

The meaning, of course, is the concept of "professional courtesy," that even the disreputable and unethical do - particularly among themselves - adhere to various sorts of moral codes of conduct.²

As to the converse, "no honor among thieves," the meaning is self-explanatory. Curiously, the concept isn't limited to the English-speaking world, as evidenced by this Spanish proverb: Piensa el ladrón que todos son de su condición. (The thief thinks that all are of his condition.)³

^{1 Early nineteenth century. "The Oxford Dictionary of Quotations," Fifth Edition, edited by Elizabeth Knowles (Oxford University Press, Oxford and New York, 2001). Page 612:11.
2 Also: "Honor is sometimes found among thieves." [Walter Scott]
3 http://www.elearnspanishlanguage.com/vocabulary/expressions/ex-proverbs.html}

Both sentence mean the same thing anyway.

In the first sentence 'also used' is stressed. and in the second sentence 'also' is stressed.

Both with reference to 'sometimes'.