The most massive difference is the lighting system on RR being the 2.0 system. RR has some additional play field decorations: castle walls, Toto, tornado
All ECLE can be various versions, all of which will inevitably need some of the boards to be replaced as they fail.
The ECLE is the only one with the wood apron - it’s actually pretty cool. Some ECLE have gorgeous direct print cabinets also.