Help with some diplomatic wording please

Your nurse is used to general public. Many in your situation would be saying they don't want to see her because the other nurse is better, or blaming her for doing it wrong all these months.

You obviously really appreciate her but having bandaging done slightly differently made a big difference to you.

Could you just tell her what you've told us, adding that you hope the compression has been sufficient & there are no ill effects on healing? & is there any way you could continue with the same regime as it's made the bandages so much easier to tolerate...

Ask her if the other nurse used a different bandage, and if she asks why, just say it felt different.
She's bound to want to know a bit more...

I completely understand where you are coming from as I had an infected haematoma which had to be removed and left a deep wound which means I need to attend my surgery twice a week to have it dressed and my compression stocking changed. I should imagine bandages are less comfortable but I would tell your regular nurse that you have been more comfortable this week and could it be because the bandage was not so tight.
As far as your notes are concerned do you have the NHS app? Under the heading Appointment notes you should be able to read what each nurse has done and why. I occasionally have to see a different nurse and find these notes very helpful.
I do sympathise and there is probably a reason why you need the bandage but you could ask about the stocking. I found my first one very uncomfortable but then the nurse gave me a slightly larger one which made all the difference. You do need to discuss with your regular nurse how it is making you feel. There may be alternatives.

My sister has been in a similar situation for a long time. She has district nurses come in twice a week. She loathes the bandages and pulls at them constantly. But they welcome her feedback as they know they can be intolerable long term. She will not be offended at all. It doesn't necessarily mean you have to change to the other nurse as your usual one will adapt her way of doing it. Tell her exactly how and why you think it felt better. I promise you she won't mind at all.