The std SV chassis is carbon fibre and 8mm shorter than the std SV2 chassis. The SV2 is longer and also made from aluminium so it's heavier and stiffer.
You can interchange them but will need to use the appropriate top deck to allow for the 8mm difference.
To further confuse matters you can also get a +8mm carbon fibre chassis (I think it was sold as an upgrade for the SV) which would be a direct fit for an SV2.
Wingers
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