Need to check the actual IP of web server in Dashboard

We need to change the web server IP (A record) in public DNS.
The A records currently show the Cloudflare Proxy IPs (two of them, two A records for the domain name); but we do not see the actual IP of the current web hosting server.

Is it true, that we just have to insert the new IP in both entries, and will this IP be shown as one of the proxy IPs afterwards again?

And if we should need to switch back to the current server, if something does not work with the new one, where can I see the current actual IP, as we do not really know the IP of the current server of our customer, as there is no documentation, unfortunately.

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