I have easy question for which I was not capable to find answer.
Even on Internet and even in my lab, because I only had RB2011UiAS-RM and RB2011UiAS-2HnD-IN (not the RB2011UiAS-IN).
Is there any possibility from winbox or ssh, to find if the router is rackmount (RM) or the smaller one (IN).
In System->Resources->Board Name (RB2011UiAS) and the same System->RouterBOARD->Model (RB2011UiAS).
I am not sure if there is any way to find if the RB2011 is rackmount or not.
If it was only between RB2011UiAS-2HnD-IN and RB2011UiAS-RM, you could look whether it has wifi or not. But also wifi-less RB2011UiAS-IN would need something different.
5 version of RB2011 without rackmount: without poe and no wifi (RB2011L), with poe but no wifi (RB2011iL),
with more memory, gigabit, usb, etc. (RB2011UAS), like the previous with poe (RB2011UiAS) and the previous with poe and wifi (RB2011UiAS-2HnD)
the only rackmount version is the RB2011UiAS-RM without wifi.
The RB2011UiAS rackmount have MAC E4:8D:8C:xx:xx:xx
The RB2011UiAS desktop version MAC 4C:5E:0C:xx:xx:xx
I wouldn’t count on MAC addresses, it’s probably just that one of your devices is newer than other. My guess is that they start to use new range when they exhaust previous one. E.g. at the beginning, for a long time, everything I remember had 00:0C:42:xx:xx:xx.