<?php
$u = [[16680548 =>
[
'videosource' => null,
'ip_address' => null,
'vlan' => null,
'commissioning_date' => '02.09.2000',
'stream_source' => null,
'stream_source_srv' => null,
]],
[16721130 => [
'videosource' => 'AON',
'ip_address' => '19.78.2.10',
'vlan' => 744,
'commissioning_date' => null,
'stream_source' => 'Aon Next',
'stream_source_srv' => null,
]],
[16721155 => [
'videosource' => 'AON',
'ip_address' => '180.98.27.199',
'vlan' => 745,
'commissioning_date' => null,
'stream_source' => 'Aon Next',
'stream_source_srv' => null,
]],
[16721157 => [
'videosource' => 'AON',
'ip_address' => '610.79.82.270',
'vlan' => 741,
'commissioning_date' => null,
'stream_source' => 'Aon Next',
'stream_source_srv' => null,
]]];
$n = [[16680548 =>
[
'videosource' => null,
'ip_address' => null,
'vlan' => null,
'commissioning_date' => '02.09.2001',
'stream_source' => null,
'stream_source_srv' => null,
]],
[16721130 => [
'videosource' => 'AON',
'ip_address' => '198.78.2.100',
'vlan' => 744,
'commissioning_date' => null,
'stream_source' => 'Aon Next',
'stream_source_srv' => null,
]],
[16721155 => [
'videosource' => 'AON',
'ip_address' => '181.98.27.199',
'vlan' => 745,
'commissioning_date' => null,
'stream_source' => 'Aon Next',
'stream_source_srv' => null,
]],
[16721158 => [
'videosource' => 'AON',
'ip_address' => '610.79.82.270',
'vlan' => 741,
'commissioning_date' => null,
'stream_source' => 'Aon Next',
'stream_source_srv' => null,
]]];
var_dump(array_diff($u, $n));