If the distribution occurred in 2022 late and it has been less then 60 days since you received the distribution, you are permitted to roll over the amount that is in excess of your RMD for the pension.
If the distribution occurred in January 2023, you are permitted to roll over the amount that is in excess of your combined 2022 and 2023 RMDs for the pension plan.
If this was a buyout of a defined benefit plan, it's not clear how you would determine the amount of the distribution that was RMD.
