Flux package

Our current solder paste vendor wants us to evaluate a paste. One of the selling points is that this paste (SnPb) will have the same flux package that will be used with some of their lead-free pastes. We are looking at going to SAC when we go lead-free, so I'm wondering if a flux package is compatible with both, or are they blowing smoke up our... Anybody have any experience or insight?

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