Backup/restore a part of config

[NicoPesto]

Hi,
After upgrading a 2.2.5 installed on an old hard drive, the current version is the latest 2.4.1.
Above, I have four users with four OpenVPN Road Warrior certificates. But, the configuration of these certificates is obsolete. And I would rather change the config of the pfsense file with a recent and valid config.xml file rather than install the four clients.exe on computers at the four corners of the world.

For that, this good post : https://forum.pfsense.org/index.php?topic=99145.0

But, i have a verification request and a question.
1. The form and content of the config.xml file, before the restoration of "all", is it good? :

<pfsense><cert><refid>xxxxxxxxxxxxxxxxxx</refid>

<type>user</type>
<caref>xxxxxxxxxxxxxx</caref>
<crt>xxxxxxxxxxxxxxxx</crt>
<prv>xxxxxxxxxxxxxxx</prv></cert>
        …
<cert><refid>xxxxxxxxxxxxxxxxxx</refid>

<type>user</type>
<caref>xxxxxxxxxxxxxx</caref>
<crt>xxxxxxxxxxxxxxxx</crt>
<prv>xxxxxxxxxxxxxxx</prv></cert></pfsense>

2. My question : do I have to delete the 4 obsolete certificates before the restoration?

Thanks.  ;)