The ISO 13485 Change was made in 2016 when the Standard was updated. There are now some differences in the approach for implementation of this Standard. ISO 13485 Medical Device Standard has become an exception. In particular there are some significant departures from ISO 9001.
The Environmental Management Standard (ISO 14001) was updated in 2015. The changes included a move to ensure that the Standard aligns better with other Standards. The new approach is more about Leadership and the context of the organisation. So, it goes beyond the inward looking aspects of the business and its goals. The Environmental Management Standard is about considering the wider scope of the environmental impact of your business.