A rebadged Dell and an original Dell look the same (i.e. black and Silver/grey with the display in the centre) apart from the Rio label that is stuck over the Dell logo.
They also differ in the firmware that displays the messages when you power up.
However, they are all compatible (Rio, Dell and rebaded Dell) so long as you use ARM 1.04 software. I (and several others on this forum) have them all working fine together on the same network.
You can download ARM1.04 from here , or get a CD from someone: I have some spares if you need one.

Cheers

M