Carrera Katalyst e-stay 250miles from new vgc £50

I wonder: is the Katalyst frame any different than the Quattro e-stay frame (other than paint, of course), i.e., was the groupset the only difference between the two?
 
...I think the Quattro was 531 tubing from memory, where this one is plain steel/basic cro-mo at best.
 
Compare the Katalyst with my Kili Wot in the link below; the 531 Quattro frame was made by Saracen, hence my makeover...:cool:
 
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