(a) In a chapter 9 or chapter 11 case, after a plan has been accepted and before its confirmation, the proponent may file a modification of the plan. If the court finds after hearing on notice to the trustee, any committee appointed under the Code, and any other entity designated by the court that the proposed modification does not adversely change the treatment of the claim of any creditor or the interest of any equity security holder who has not accepted in writing the modification, it shall be deemed accepted by all creditors and equity security holders who have previously accepted the plan.

(b) If the debtor is an individual, a request to modify the plan under § 1127(e) of the Code shall identify the proponent and shall be filed together with the proposed modification. The clerk, or some other person as the court may direct, shall give the debtor, the trustee, and all creditors not less than 20 days’ notice by mail of the time fixed for filing objections and, if an objection is filed, the hearing to consider the proposed modification, unless the court orders otherwise with respect to creditors who are not affected by the proposed modification. A copy of the notice shall be transmitted to the United States trustee. A copy of the proposed modification shall be included with the notice. Any objection to the proposed modification shall be filed and served on the debtor, the proponent of the modification, the trustee, and any other entity designated by the court, and shall be transmitted to the United States trustee. An objection to a proposed modification is governed by Rule 9014.