35mm Kodachrome will beat the snot out of 70mm anythingelsechrome (or anythingelsecolor).
Since it's a reversal film, it will need to have an internegative made so that large numbers of prints can be distributed, but a 70mm (or 90mm) internegative generation would probably be capable of capturing most of what the Kodachrome original had captured.
Or, the original reversal film can be scanned, and then prints (of any desired format) printed via a digital-to-film printer directly onto the release print film.
Of course, this is all moot, as none of it will ever happen.