From Wikipedia: Rubber Soul was released on compact disc 30 April 1987, with the 14-song UK track line-up now the international standard. Having been available only as an import in the US in the past, the 14-track UK version of the album was issued on LP and cassette on 21 July 1987.

 

As with the Help!  album, Rubber Soul  featured a contemporary stereo digital remix of the album prepared by George Martin. Martin expressed concern to EMI over the original 1965 stereo remix, claiming it sounded "very woolly, and not at all what I thought should be a good issue". He went back to the original four-tracks tapes and remixed them for stereo.

When the album was originally released on CD in Canada, pressings were imported from other countries, and used the 1987 remix.

 

However, when the Disque Améric and Cinram plants in Canada started pressing the album, the original 1965 stereo mix was used by mistake. This was the only source for the 1965 stereo mix in its entirety until the release of the Beatles mono box set in 2009.

 

A newly remastered version of the album, again using the 1987 George Martin remix, was released worldwide with the reissue of the entire catalogue on 9 September 2009. The original 1965 stereo and mono mixes were reissued on that date as part of the mono box set.