Can I Post an Article in two different directories?

It's really difficult to measure, KP. I'll try to explain why.

It depends whether you mean "directly" or "indirectly".

The value, to me, of all those EZA articles is that EZA is the syndication-source for webmasters and ezine/newsletter compilers to go to (this is what an article directory is: a depository of available content for people to re-publish - and this is why it was originally called "Ezine Articles", because it provided articles "for ezines" - though now they're more "for websites" than "for ezines", admittedly).

The important thing about article marketing is to get your work as well and widely syndicated as possible, so that you increasingly build up high-quality, context-relevant backlinks and targeted traffic leading to opt-ins (list-building) and sales for your business. This means thinking well beyond article directories. "Paradoxically" (though not really!) EZA is how you get well beyond article directories, because it's where webmasters and others go for available content.

I submit to 6 or 7 directories (changing a punctuation-mark in each version, just so I can later identify its original source). But the reality is that it's almost always EZA from which the articles are syndicated. When an article gets re-published on someone else's site, I detect that and contact them, offering them more/further/better content if I like their site and want their traffic. On the same terms as EZA's, of course: they must include my resource-box. But they've already done that once (otherwise they get a different email followed, if necessary, by a DMCA notice instead!).

Of course, I'm also getting some traffic and some sales directly from EZA, too, like anyone else - and I'm doing some keyword research and using catchy titles and compelling resource-boxes and all the rest of it, in an attempt to ensure that outcome.

I'm not trying to sell in my articles, because nobody's going to syndicate that.

And I'm definitely not "writing for clicks", which is a sure way to limit your income.

And I do much better now (with an average CTR around 17%/18%) than I did a year and a half ago (when my average CTR was 37%/38%) because I was "writing for clicks" then, which was a huge mistake.

What I'm doing now is a different model of "article marketing" from the one being taught in all the courses, books, programs, and so on. They're teaching a "rinse and repeat" model which aims for fast traffic, the highest CTR, and "writing for clicks", and is best summarised, I think, by those deadly off-putting words "rinse and repeat". I'm aiming at building a business which leads to gradually increasing residual income from work already done, so that I don't have to "rinse and repeat", but can let the income gently increase while I move on to something else - the idea is that my "something else" is additional to, not a replacement for, an existing source of income.

So this is why your question's hard to answer. Directly, I'm not making any more from EZA articles than anyone else is (and in fact I might be making less, because my CTR is lower than that of many people - though I hope my product selection-skills compensate for that!), but indirectly, it's "having published my work on EZA" (after getting it all indexed on one of my own sites first, of course) that's leading to a lot of subsequent income and business growth.