Well, almost the same. The rio-car has, as a later issue empeg-car mk2, various tweaks to the design - a different rotary control (doesn't slip), 16MB of dram instead of 12MB (chip availability), and a few fixes to the PCB to address the most common weaknesses of the empeg-car mk2 design (ie, anything which caused a warranty return, we tried to fix so we wouldn't get rio-car's coming back).

Hugo