Recently picked up a second Rubicon and noticed that it was revision 7 whereas the one I already had is revision 8. What is the difference? I’m assuming it’s pretty minor, maybe even just the faceplate. Either way, looking forward to experimenting with a “twobicon” 
They are basically the same
I figured as much, but was hoping to be enlightened. Must be a well guarded secret 
Often times there are minor revisions between batches to make manufacturing easier or to replace parts that aren’t easy to source with other ones, and they don’t affect how the module actually operates in any significant way.
Thank you for elaborating, kamil! I’ve been enjoying them a lot, but I’m also looking forward to upgrading to the Rubicon II when it is released.