In principle, it is to be expected that numbers are not exactly the same while evaluating against a different data set (the mc-set versus the rg-set), taking a different set of synsets to evaluate on (changing PoS-tag restrictions) or changing configuration settings that influence the similarity score.
a variation of up to 0.44 points in Spearman ρ and 0.60 in Kendall τ 6 leads to the question of how indicative these results really are.