Unless some third-party plugin was used that is differnt or not available across platforms, the only problems or differences should be in fonts. Windows cannot use Mac-format .dfont, TrueType or Type1 fonts at all, but Mac can use Windows fonts (TT in the normal font locations, T1 in the private InDesign fonts folder), and in cases where a same-named font (but paltform appropriate) is used on both platforms in either TT or T1 formats there is the potential for text flow differences between differnt versions. Best practice for working cross-platform is to use OpenType fonts only.
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