I am using Azure App Service to host my NodeExpress application, I am right now stuck at a very strange requirement.

I have 2 different azure app services.
1) myApp
2) sampleApp

I have a domain pointed at myApp. (Added hostname www.myapp.com)
now I want to delete myApp and shift my hostname (www.myapp.com) to sampleApp.

now my Question is,

will it change my IP Address? (This I think it would because I haven't bought any static IP)

if my app service pointing IP is changed, will I have to do anything with the domain DNS manager to move www.myapp.com in hostnames of sample app?

I don't have access to DNS Manager because client has it. I have to tell client to add CNAME to verify domain ownership. I want to point this domain to different app service without adding delay of asking my client to change its cname to verify domain ownership.