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The OTP eFuse registers should be locked in order to avoid unwanted registers (and then MAC addresses) modifications. OTP lock grants the MAC values cannot be modified anymore.
{{ImportantMessage|text=If not locked yet, OTP bits can be set to ''''1'''' but not reversed to ''''0'''' value, so some modifications can be applied if the eFuse registers are not locked. For more information see, for example, the [https://www.nxp.com/webapp/Download?colCode=IMX6SDLRM i.MX6 Dual Lite Reference Manual chap. 47.3.1.3] }}
The two MAC addresses - even if sharing register <code>bank:9 word:1</code> - can be programmed at different times.