Lots to unpack here. While in planning, before the various management plans have approved, baselined and placed under the configuration management plan, then you do not need a change request. This makes perfect sense because if every draft version needed a change request we be in change management hell.
A change request for a project charter is (and we make get into a flame war on this one) does not need a change request. It is thought of as a document that is outside the project (it actually initiates the project). Best practice is that if you need to change the project charter you would amend it and have the project sponsor approve the amendment.
Hope this helps.