The Canada 2019 tariff update appears to be quite a large update. A list of old/new codes in Excel can be found here.
The update will also include rates for the new Comprehensive and Progressive Agreement for Trans-Pacific Partnership Tariff ( CPTPT ).
Additional information about the update can be found here:
8 digit correlation: https://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/2019/conc-8-eng.html
10 digit correlation: https://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/2019/conc-10-eng.html