Changes and relation to DR plan

Answer:
In order to avoid that changes have negative impact on Disaster Recovery (DR), Change Management process should be set in following way:
1. Changes that affect DR should not be authorized without involvement of DR Manager (or, according to ITIL, IT Service Continuity Manager). How to do that - since e.g. minor changes are authorized by Change Manager, he should be involved in DR plan and concept (or, environment, as stated in the question).
2. IT Service Continuity Manager (ITSCM) should be member of the Change Advisory Board (CAB). In such way, it will be ensured that no significant changes are authorized without approval from ITSCM i.e. DR.

To learn more, see the articles:
"Change Advisory Board in ITIL – advise, approve or what?" https://advisera.com/20000academy/knowledgebase/change-advisory-board-itil-advise-approve/
"IT Ser vice Continuity Plan – Why do you need it?" https://advisera.com/20000academy/blog/2017/05/02/it-service-continuity-plan-why-do-you-need-it/