Hello Paul, There is no such thing as necessary when it comes to your own build. I think we have no authority to amend changes if you don't ask for our opinion. I tried to help you put meaningful translation Mr.Deep replied.
You did a decent job on the second planking! However, this is not the way I would do it. But it doesn't mean it is necessary to re-do it the way I do, or others doing. In every work, there is a thing called 'Level of Acceptance'. Did you satisfy with the planking you made? Do you accept the job? If yes, then move on. If you have doubts, then you may need to re-do... There are many books and references for basic planking techniques. Take a look at some, they may be a good reference to help if you decide to re-do. But... before you made a decision - think twice!!!
https://www.modelerscentral.com/blog/planking-tips-for-building-a-model-ship/