I know there has been some question to if a Versa band can fit a Blaze... Well I have been looking at pictures of bands for the 2 trackers and if the width of the band where the pins are located are the same length for both models then it looks like it would fit unless a different size pin is used. I have seen some bands being marketed to be compatible for both and the reviews say that they fit without any problems. The only reason why I would think that it has been said that a Versa band wouldn't fit on a Blaze is because the silicone bands for the Blaze have ridges. I have some Blaze bands that are of different material/not silicone and don't have those ridges and fit without any problems on the frame. The only reason why I keep looking to see if a Versa band will fit on a Blaze is because the selections for the Blaze are starting to get smaller and other trackers have more cooler bands and my Blaze still works so I don't want a new tracker unless someone gives me a Versa as a gift or if, which so rarely happens to me, I just so happen win one in a contest/giveaway. Haha. 
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I'm sorry but they are not interchangeable. There is always something different about the band or the watch that make them not interchangeable
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