Google Analytics tracking 2 different contact form 7 in a singular page with DOM

I have 2 different contact form 7 in one page.

I want to tracking the single submission of the form because in Google Analytics i have 2 different conversion goal.

The code i’ve used is this:

<script>
 document.addEventListener( 'wpcf7mailsent', function( event ) {
 ga('send', 'event', 'Form contatto', 'submit', 'lead contatto diretto');
 }, false );
 document.addEventListener( 'wpcf7mailsent', function( event ) {
ga('send', 'event', 'Form contatto', 'submit', 'lead generation landing');
}, false );
</script>

But in analytics the goal being tracked doubles.

How i can specify for each form, the right event to send to GA?