I can confirm with 100% accuracy that if one wishes to change from 15" rear to 17" and 18" front to 19", one does not need to buy new spokes for both rear and front. The original spokes are of sufficient lengths.
These are the proof. My Zong is outfitted with rear Mitas E07 130/80-R17 on a 2.5x17 rim with stock spokes and front Mitas E07 110/80-R19 on a 1.85x19 rim also with stock spokes.
Can't wait to try them out!
Rear Mitas E07 130/80-R17 on 2.5x17 aluminium rim.
Front Mitas E07 110/80-R19 on 1.85x19 aluminium rim. Note the clearance between mudguard and tyre. Entirely stock.
Note that after changing to 17 rear and 19 front, the double stand is unable to give ground clearance to both wheels. Only managed to keep the bike stable.
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People sit on an exploding, volatile, fast-moving two-wheeled killer machine, and call it "enjoying the moment". 
No wonder aliens never make contact with us. 
- A Zong rider-
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