I didn't really want to spiral this into a discussion of emergency medicine training in India, because it's such a mess. Also, I acknowledge that others (including yourself and the OP) may know more about this topic than me, or have more information. I am happy to be corrected. My knowledge comes from working in the region. In the department I work in, we have quite a few docs from India and the specific training pathways and how they've shaped their careers is a common topic of discussion, so I am somewhat (but not absolutely) confident of what I'm saying.
But to resolve our disagreement: we might be talking about different things. There aren't any true 'emergency medicine residency programs' in India exactly.
There are several different pathways:
-MD in EM (doesn't mean what we'd think it means, as the main medical doctor degree in the country is MBBS, newer thing, still unclear what's going to happen with recognition of it (at this time it's recognized but for some reason general consensus is that this is questionable); there are also only 84 spots through 30 institutions)
-DNB in EM (2-3 years, there seem to be about 20 accredit programs in this pathway offering around 90 spots (though I can't confirm this as I can't find a comprehensive list of DNB programs from an official source; in the past this was a way for essentially 'fellowship' training in EM after specialization in another field, though I believe this is no longer the case)
-MEM (most similar to a US style residency program in my opinion, which is what I was referring to, with one bing run by GWU and another by SEMI; however there are a lot of variable MEMs in other centers that are kinda dodgy. Also, technically even the GWU program is not recognized by the MCI, each MEM seems to graduate around 50-60 people per year).
-Fellowship in EM: don't know much about this.
Also, if you are referring to the GWU program for example, it's one program that I believe trains people at 5-6 different primary sites (at least according to their website). I could imagine that someone could say these are 5-6 different training programs. By training programs I was referring to MEMs like the GWU program (and considering all of their sites as one program). By that count, there are only two residency-like training programs in EM in India: the GWU program and the SEMI program. I couldn't find the Aster programs you are referring to on the MCI list or non official lists of training programs. Could be they are not up to date, or could be these are non accredited training programs of some sort.
In summary, there are very few training programs in India that even approximate what EM training in the US is like. They suffer from issues of quality, recognition, or both. As to work opportunities: I think you meant less opportunity to work
than in the US? Because there really isn't any opportunity to work in the US without doing some post graduate training in the US. Licensure alone requires FMGs to complete usually 3 years of post graduate education in the US.
Some resources to back up what I'm saying:
College and Course Search | MCI India
Illegal 'PG degrees' plague emergency medicine - Times of India
https://nbe.edu.in/mainpdf/curriculum/EMERGENCY-MEDICINE.pdf
Program Graduates | The Ronald Reagan Institute