Identically mac on RB750GR3

We buy two RB750Gr3 for VRRP reserves and strange we can get two absolutely identical devices MAC, Serial, RouterOS…
it is normal?

Hello nordicx86,

Please write an e-mail to support@mikrotik.com or create a request via https://help.mikrotik.com/servicedesk and attach a supout.rif files from both devices.
On the device itself the serial number is the same as in RouterOS?

Some people dream of having a spare like that: http://forum.mikrotik.com/t/ip-cloud/127115/1
But still, if this turns out to be true, it is a little concerning. How would the IP/Cloud DDNS service handle this (on the server side) if two of these devices enable DDNS?