They're all Ubisoft, difference in versions if you bought from STEAM, Amazon, GOG, whatever. Prior to STEAM there was a disc version or a downloadable from the predecessor to GOG, that's what I have.
Lower right corner of the main menu screen should be a number, V1.3, V1.4, or V1.5. That will tell you what version you have. 1.4 was the last free patch, 1.5 added U-boats and was sold as an expansion, these days nearly all new purchases are "GOLD" versions already patched and updated to 1.5.
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