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Well keeping in mind they are both made by the same company, the way to root them is going to be the same, and they both no doubt have the same boot-loader. The only difference is just going to be the coding that will need a modification in order to root and super user the phone
The Eris has been rooted you can read about it here. Going on what has been said I will share some more info that I just found out about the Devour. Now this is running Android 1.6 with the maintenance release that was pushed out by Verizon.
Technology: CDMA 1X
Software Version: CALAND_X_01.15.08P
Flex Version: XS4VRZ02CAL01NA01D.OR
Bootloader Version: 1446
DRM Version: N/A
Now I don't know at the moment if this helps us or not, but it doesn't hurt.
Just becase they are made my the same company, doesn't make rooting them the same. If that were the case the Eris would be rooted already. You should try talking to some of the dev's over on XDA and see if they can offer any constructive input.

... I'm sure several people in here will help. We are very anxious to help in anyway we can. If we all take a piece we might can finalize by the first of july.
!!!!!!!!I would be grateful for any root access, as my wife does not need MotoBlur, and disabling it has proven to be a major hassle.
Thanks in advance for any work you perform on this!!!
yes, it's possible to use the phone without motoblur, some of the blur apps might not function correctly but it works for me. in order to do it you have to activate the phone, then hard reset, then bypass activation screen, then dial *228 option 1 or *22899 to auto activate. plug in your gmail and your contacts will come back to you
hope this helps
update: i'm working 70 hours this week.....
and looking at getting an LG ally.... it cost $370 new full retail instead of the devour at $430 full retail so as an employee im probably going to swap it out for the ally or get the shadow or droid 2