Helvetica Neue

Well, I'm not entirely sure about that. Helvetica has a long history, and there are a lot of strange free font versions floating around with the name Helvetica. If you want to stop doubting altogether, you should inquire from Linotype, the original foundry. It's usually called “Neue Helvetica” and has some 59 typefaces. There is a Pro version and then alternative/standard or “regular” versions. https://www.linotype.com/1266/neue-helvetica-family.html

Generally, a PRO font is going to be a full feature font with all the glyphs and language characters. An STD version is usually not as expensive and doesn't have all the functions found with PRO. If you are comparing unicode attributes letter by letter, then maybe they are the same for some characters. I think it depends on the project and the end use. As you know, there are a lot of other things to consider when selecting a font. Curious if you were trying to find an answer about licensing or an application?