Laravel – change call method addMonth() to addMonthsWithOverflow() carbon

i update all my project built in laravel.

In any part of this project i have this code: $FI->copy()->addMonth(3)->subDay();

but when pass phpStan return

Method CarbonCarbon::addMonth() invoked with 1 parameter, 0
         required.

I´m reading and now i have to change to this method $FI->copy()->addMonthsWithOverflow(3)->subDay();

But i don´t know if this code it´s same that previous code.. I´m building script to try check if both dates it´s same:

$period = CarbonPeriod::create('2023-12-31T00:00:00Z', '2024-05-31T00:00:00Z');

    // Iterate over the period
    $dates = array();
    foreach ($period as $date) {
        $date->format('Y-m-dTH:i:sZ');
        $final_date = $date->copy()->addMonth(3)->subDay();
        array_push($dates, $final_date);
    }

    foreach ($dates as $key => $value){
        echo "key ".$key." value: ".$value."<br>";
    }

    echo "<br>";

    $dates2 = array();
    foreach ($period as $date) {
        $date->format('Y-m-dTH:i:sZ');
        $final_date = $date->copy()->addMonthsWithOverflow(3)->subDay();
        array_push($dates2, $final_date);
    }

    foreach ($dates as $key => $value){
        echo "key2 ".$key." value2: ".$value."<br>";
    }

i can show that both dates it´s same, but i need be sure that this new method it´s correct.

Thanks for readme and sorry for my bad english