Strangely enough, though MAC is releasing 4 different bronzers with the Hey Sailor collection, they come in 2 different formulations.
Pro Longwear Bronzer: "Combining comfort, flawless sheer-low transparent coverage and long wear, this is bronze with a fully dimensional yet natural finish. "
Bronzing Powder: "A lightly frosted, tinted powder that gives skin sheer, natural colour effects and highlights. Ideal to enhance and strengthen a tan."
Both formulations come in the same compact, which is a navy and white stripe on the outside with a nice sized mirror on the inside. It is definitely a bit heavier duty than other MAC compacts and could easily be carried around with you all day. I didn't really notice a difference between the 2 formulations in terms of pigmentation level or application. Soft Sand (the regular bronzer) does have a touch more fine shimmer (which MAC calls frost), but I think that's the main difference.
Nude on Board: A basic bronzy yellow, I didn't think it was too dark for my pale skin (I'm NC15 or so), and I liked that it didn't come across as orange.
Soft Sand: This golden bronze was very similar to Nude on Board but with a touch more golden shimmer.
Either would be a good choice for a summer bronzer.