Is Lisbon Treaty 98% of the EU Constitution?

Former French President Valéry Giscard d’Estaing has claimed that the Lisbon Treaty is 98% identical to his failed EU Constitution.

“The EU Constitution has now been repackaged as the Lisbon Treaty.”

“The EU Constitution has not been repackaged as the Lisbon Treaty.”

Both the above sentences are more 98% identical, but their meanings are quite different.

Could that be what he means?

What's clear is that any major document could be modified by the inclusion or exclusion of key sentences, phrases or single words and its meaning can be substantially changed. So the "98%" claim can be essentially meaningless.