Can add two different JS events on same HTML tag for different function

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Javascript

HTML

I have two select options with 2 different js function codes, But 2 select options are same one is doing count and another one is using to show the locations in map. I need to combine both select option as common, like if i choose abinash to the count and as well as locations in map.

Thanks in advance

What I have tried:

<pre> </div class="form-group">
        <div class="">
          <label  class="text-center p-1" for="category_state">Select Regional IT </label>
          <select id="category_itrep" onchange="filterMarkers(this.value);" >
              <option value="">Please select RIT wise</option>
              <option value="Abinash">Abinash</option>
              <option value="Jayakumar">Jayakumar</option>
              <option value="KA_Vacant">KA_Vacant</option>
              <option value="Manmohan">Manmohan</option>
              <option value="Narayanan">Narayanan</option>
              <option value="Nisvanth Kanna">Nisvanth Kanna</option>
              <option value="Rajkumar Kalal">Rajkumar Kalal</option>
              <option value="Ranjan Kumar">Ranjan Kumar</option>
              <option value="Ravikumar">Ravikumar</option>
              <option value="SP_Vacant">SP_Vacant</option>
              <option value="Thakar Sapan">Thakar Sapan</option>
              <option value="TN_Vacant">TN_Vacant</option>
              <option value="Yogesh">Yogesh</option>
          </select>

        </div> </br>
  <div class="form-group">
      <div class="">
      <select id="mySelectElement" onchange="myFunction()"> <option value="">Please select RIT wise</option>
              <option value="Abinash">Abinash</option>
              <option value="Jayakumar">Jayakumar</option>
              <option value="KA_Vacant">KA_Vacant</option>
              <option value="Manmohan">Manmohan</option>
              <option value="Narayanan">Narayanan</option>
              <option value="Nisvanth Kanna">Nisvanth Kanna</option>
              <option value="Rajkumar Kalal">Rajkumar Kalal</option>
              <option value="Ranjan Kumar">Ranjan Kumar</option>
              <option value="Ravikumar">Ravikumar</option>
              <option value="SP_Vacant">SP_Vacant</option>
              <option value="Thakar Sapan">Thakar Sapan</option>
              <option value="TN_Vacant">TN_Vacant</option>
              <option value="Yogesh">Yogesh</option>  </select>
      <h6> Total Number of Branches attend by the specified RIT:
          <span id="branch_counts">0</span> </h6>
      </div>
  </div>
      </div>