Is it possible to differentiate selectors with only $ (this)?

In theory, only with $(this) could not be done. this is the element that is the object of the action, but it does not save any type of information about the other elements in the selector, so from btn_1 you could not know if btn_2 is part of the selector to click in it (and vice versa).

That's why I was asking if that was your structure, because the closest thing would be to select the sibling elements and force a click on them too ... although that is also a bit complicated (not too much).

In old versions of jQuery it was selector that returned the selector used, but it was considered obsolete from the version 1.7 and was removed in 1.9 (apart from that it seems that it was not very effective).

Another option, although I would personally consider it a cheat, is to pass the selector as a parameter to the click event handler and from there use it to do what you want (something similar to what you put in the comments and to the Jorius method ). Using on you can optionally pass data:

.on( events [, selector ] [, data ], handler )

that will be read in dataset . Yes technically it's not this , that's why I say it's "cheat", but it works and you just have to write the selector in a site:

var miSelector = '#btn_1, #btn_2';

$(miSelector).on('click', { selector: miSelector }, function(e){
  
  $(e.data.selector).each(function() {
    console.log($(this).find("span").text() );
  });
  
});

<script src="https://code.jquery.com/jquery-3.0.0.js"></script>

<button id="btn_1"><span>Span1</span> Button 1</button>
<button id="btn_2"><span>Span2</span> Button 2</button>

I do not think that selectors can be differentiated using the object $(this) (I did not find anything in the official documentation and looking for a while on the internet) but you can assign each of the objects to a variable in the following way:

We create a function called trigger passing it as argument our selector and it is triggered when any of our elements is clicked , there in the function we do a .each to these elements and we put the respective objects to the object buttons and then we show their respective text as independent variables

var buttons = {};

function trigger(selector){
  $(selector).each(function(i, e){
    let c = i+1;
    buttons['btn'+c+'conSpan'] = $('#' + e.id + ' span');
  });
}

$('#btn_1, #btn_2').on('click', function() {
  trigger('#btn_1, #btn_2');
  console.log(buttons.btn1conSpan.text());
  console.log(buttons.btn2conSpan.text());
});

<script src="https://code.jquery.com/jquery-3.0.0.js"></script>
<button id="btn_1"><span>Span1</span> Button 1</button>
<button id="btn_2"><span>Span2</span> Button 2</button>

In addition to the response from @AlvaroMontoro , the code could be simplified more and with the benefit of using event delegation

So for example:

$(document).on('click', '#btn_1, #btn_2', function(evt){
  $(evt.handleObj.selector).each(function() {
    console.log($(this).find('span').text());
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<button id="btn_1"><span>Span1</span> Button 1</button>
<button id="btn_2"><span>Span2</span> Button 2</button>

I hope it's useful.

<ul id="equipos">
     <li id="1"><a href="#">1</a></li>
     <li id="2"><a href="#">2</a></li>
     <li id="3"><a href="#">3</a></li>
     <li id="4"><a href="#">4</a></li>
</ul> 

$('#equipos').click(function(e){
     var id = e.target.id;
     alert(id);
}); 

I hope it is what you are looking for.

$('#btn_1, #btn_2').on('click', function(e) {    
  let val = $(this).find('span').text();
  let id = $(this).attr('id');
  	  console.log(val);
  	  console.log(id);
});

<button id="btn_1"><span>Span1</span> Button 1</button>
<button id="btn_2"><span>Span2</span> Button 2</button>
<script src="https://code.jquery.com/jquery-3.0.0.js"></script>