@Derben, Since your first two panels are single value results | stats count. You can use <search> Event Handler to set the results of first two panels as tokens and then use them in the third panel. Similar to one of my older answers: https://answers.splunk.com/answers/580233/use-values-from-two-panels-in-a-third-panel.html
Please find below a run anywhere example which has dummy searches with Input and Output count set via text box for testing. You can replace the two panel searches with your own search. (PS: Also for testing I have a hidden time input using depends="$alwaysHideDefaultTimeForDemo$" since dummy makeresults command does not need time I have set it to Last 1 second).
<form>
<label>Compare two panels and show result in third</label>
<fieldset submitButton="false">
<input type="time" token="tokTime" searchWhenChanged="true" depends="$alwaysHideDefaultTimeForDemo$">
<label>Time (default value)</label>
<default>
<earliest>-1s@s</earliest>
<latest>now</latest>
</default>
</input>
</fieldset>
<row>
<panel>
<title>Input</title>
<input type="text" token="tokInput" searchWhenChanged="true">
<label>Enter Input count for testing</label>
<default>10</default>
</input>
<single>
<search>
<query>| makeresults
| fields - _time
| eval count=$tokInput$</query>
<earliest>$tokTime.earliest$</earliest>
<latest>$tokTime.latest$</latest>
</search>
<!-- Your First Query Goes Here-->
<option name="refresh.display">progressbar</option>
</single>
</panel>
<panel>
<title>Output</title>
<input type="text" token="tokOutput" searchWhenChanged="true">
<label>Enter Output count for testing</label>
<default>4</default>
</input>
<single>
<search>
<query>| makeresults
| fields - _time
| eval count=$tokOutput$</query>
<earliest>$tokTime.earliest$</earliest>
<latest>$tokTime.latest$</latest>
</search>
<option name="refresh.display">progressbar</option>
</single>
</panel>
<panel>
<title>Result</title>
<table>
<search>
<query>| makeresults
| fields - _time
| eval message=if($tokInput$>=$tokOutput$,$tokInput$-$tokOutput$,$tokOutput$-$tokInput$)
| eval message=if(message>5,"WARNING","GOOD")</query>
<earliest>$tokTime.earliest$</earliest>
<latest>$tokTime.latest$</latest>
</search>
<!-- No changes required for this query -->
<option name="count">10</option>
<option name="drilldown">none</option>
<option name="refresh.display">progressbar</option>
<format type="color" field="message">
<colorPalette type="map">{"GOOD":#65A637,"WARNING":#D93F3C}</colorPalette>
</format>
</table>
</panel>
</row>
</form>
While the simple XML I have provided is for results to be displayed in third panel via a Table with Color ranges, you can get Status Indicator Custom Visualization which can display the same with Color Icon and Text message. Following is code for third panel in case you have Status Indicator Custom Visualization available.
<panel>
<title>Result</title>
<viz type="status_indicator_app.status_indicator">
<search>
<query>| makeresults
| fields - _time
| eval diff=if($tokInput$>=$tokOutput$,$tokInput$-$tokOutput$,$tokOutput$-$tokInput$)
| eval message=if(diff>5,"WARNING","GOOD")
| eval icon=if(diff>5,"times-circle","info-circle")
| eval color=if(diff>5,"red","green")
| table message icon color</query>
<earliest>$tokTime.earliest$</earliest>
<latest>$tokTime.latest$</latest>
</search>
<!-- No changes required for this query -->
<option name="drilldown">none</option>
<option name="status_indicator_app.status_indicator.colorBy">field_value</option>
<option name="status_indicator_app.status_indicator.fillTarget">background</option>
<option name="status_indicator_app.status_indicator.fixIcon">warning</option>
<option name="status_indicator_app.status_indicator.icon">field_value</option>
<option name="status_indicator_app.status_indicator.precision">0</option>
<option name="status_indicator_app.status_indicator.showOption">1</option>
<option name="status_indicator_app.status_indicator.staticColor">#555</option>
<option name="status_indicator_app.status_indicator.useColors">true</option>
<option name="status_indicator_app.status_indicator.useThousandSeparator">true</option>
</viz>
</panel>
