My 2010 Kona Jake the Snake developed a cracked frame (at the bottom of the seat-tube right on the weld) which appears to be a manufacturing fault. Kona have replaced the frame (under their 4 year warranty) with a new one but it's a 2012 frame which isn't compatible with a number of the components - the BB, headset, seat post and front derailleur, according to Kona's tech guy - from my 2010 frame. Kona haven't provided the replacement non-compatible components and seem to be saying that they're not obliged to supply them. So now I have a replacement frame that's not fit for purpose.
I was wondering if anyone else here had encountered similar compatibility issues with warranty-replaced frames, and what was the outcome? It seems that manufacturers change frame/bike specs every other year these days.