Marketo Email Insight vs Email Insight API Data

[mohan-chougule-asentech]

Hi
I am using Rest api to export lead activities using "activities" API. I am able to fetch the activity data, but when I match day wise data count from exported data against the data count from marketo, I am having count difference. Minor difference is understandable. Please suggest.

Testing PHP Code:

$url = $this->host . "/rest/v1/activities.json?access_token=" "&activityTypeIds=9,10,11&nextPageToken=" . $this->nextPageToken;
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('accept: application/json',));
$response = curl_exec($ch);

Thanks.