You can use a site like this [17] to compare versions (put the older version in the "Original" field.
A list of changes can be found here [18].
Links
[1] https://corp.arisia.org/Policies
[2] https://corp.arisia.org/Policies-2020-06-16
[3] https://corp.arisia.org/Policies-2019-03-12
[4] https://corp.arisia.org/Policies-2018-12-17
[5] https://corp.arisia.org/Policies-2018-10-25
[6] https://corp.arisia.org/Policies-2018-05-17
[7] https://corp.arisia.org/policies-2017-11-17
[8] https://corp.arisia.org/policies-2017-09-17
[9] https://corp.arisia.org/policies-2017-04-27
[10] https://corp.arisia.org/policies-2016-04-10
[11] https://corp.arisia.org/policies-2015-10-19
[12] https://corp.arisia.org/policies-2014-08-03
[13] https://corp.arisia.org/policies-2014-07-01
[14] https://corp.arisia.org/Policies-2014-05-17
[15] https://corp.arisia.org/Policies-2014-04-22
[16] https://corp.arisia.org/Policies-2014-03-19
[17] https://www.changedetection.com/comparepages.html
[18] https://docs.google.com/spreadsheets/d/1p1bcGpBf-LXttMOqhoAjPhh1bpM7HeHVX8bsU0pd4Rk/edit?usp=sharing
[19] https://corp.arisia.org/taxonomy/term/1