Change of circumstances

Hi!
I'd sent in a letter to the DWP equivalent in July following my catract and laser surgery. I hadn't heard anything and I'd sent it registered post.

I called up today to see if they had received the letter. It was explained to me that this was sent to the reconsiderations team to review and they'll get to it when they can.

I then asked what happens if my circumstances changed post-surgery as my vision is now stable for now.

My next review would've been in July 2028 extended from October 2027.

I didn't realise I had to ask for a change of circumstances. What I didn't want to happen is to get to July 2028 and for them to turnaround and say why I hadn't told them about the change of circumstances. I think based on the pip descriptions I'd receive PIP standard daily living but not mobility. I've also long covid since my last review in 2023. Whether it was right to ask for a change of circumstances or wait until the review in July 2028 - I don't know if I've jumped the gun!. I would've been receiving something I'm not entitled to.

I've a few questions:
Is it treated like a new application?
Will they compare my review in 2023 to my new application?
Do I submit the same evidence as before if they already have it on file?
Did I jump the gun on asking for a CoC? What's the difference between waiting on the review in 28 and a CoC?

Any advice or suggestions.

Thanks