Virtex5 vs Virtex6

Hi there
I have synthesized the same code targeting both Virtex5 and Virtex6. I was expecting to get same number of LUTs because both of them have 6 input LUTs. However number of LUTs for the case of Virtex5 was less than that of Virtex6 by approximately 30 LUTs. Is there any justification for this? Thanks

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