collaboration where sequel tops the original

In your opinion, share examples of where the second recording by a special collaboration of musicians and producers is better than a solid first effort? Here is my current example: Floratone II by Bill Frisell, Matt Chamberlain, Lee Townsend and Tucker Martine. Still groovy, but lighter on its feet with more twists and turns than their 2007 "freshman" effort. Super production level on both the first and the sequel. Highly recommended.

Yours examples and recommendations?
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are you talking about second release or re-issue?
please clarify
Blue Oyster Cult - Self titled was bettered by Tyranny & Mutation...

The Band's so-called "Brown Album" vs Music From Big Pink.

Cream's Disraeli Gears vs Fresh Cream.
It happens frequently. The first one that popped into my head was Candy O by The Cars. The first was good, the second, for me, was much better.
I think the OP refers to collaborations that are not regular working bands, but groups of musicians assembled for special projects. In this case it's not difficult to understand why second efforts might be superior: the musicians are not as familiar with each other's styles as they would be as part of a long-standing collaboration, so a second effort would (almost by definition) be superior.
Frogman got it right. I was thinking of loose collaborations like Derek and the Dominos, the Traveling Wilburys, Byrne and St Vincent, etc.
Steve Hackett knocked the ball out of the park with his recent "Genesis Revisited 2" release. Its a must have for any serious Genesis fan.