Dissemination plan - this is about outputs - typically end of grant activities.
Includes reports, publications, book chapters, flyers, public seminars, stakeholder feedback
Communication - this can be for both during the grant and end of grant.
Will include things like how you will communicate with stakeholders, collaborators and other team members during the research process. Could be about social media strategies to communicate the process and progress of your work.
May include reporting and other media.
KT plan - Includes all of the above and more.
Strategy, specification of partnerships, roles, goals, implementation, evaluation and impact measures.