I did some more research and found the fix for the call log being shared on both phones under same AppleID.
it’s was posted by another user, Yes, that’s why they have a forum. Instead of the only option being separated IDs, which was the answer given by more than one user.(quite sarcastically by some, I might add)
this user seems to know more than some. Even if it turns out to be incorrect, it was politely answered by:
User profile for user: Gheaney

Gheaney
User level:
Level 1
12 points
Sep 27, 2023 11:16 AM in response to AlFrued
Call History on multiple devices problem solved after IOS 17 update:
Go to - Settings - Apple ID - iCloud - Show All - scroll down to Phone and turn off toggle - Hope this helps, It solved my problem with 3 iPhones with the same Apple ID.
Thanks, user “Gheaney”!