Won't help. Ebay won't see photos to compare. And even different watches in the same series/range can theoriticaly be a bit different, that is what Ebay will probably say even if they see the photos. Won't help, that is why you shouldn't be that greedy, especially when it comes to watches.
A watch is a status symbol, if you can't afford it at the going street price, you shouldn't buy it. Hardware I understand getting for less because it is a thing of utility and not show off.
But any expensive watch is more often that not a show off thing and there is no point showing off something you can't genuinely afford.
If you can buy a 5k watch comfortably, go for one, whether online or within India, if you have 50k to burn, go ahead. But don't try to get stuff at half rate or something unless it is from a store like Macy's or something where you know it is just old stock.