Child themes typically load the parent’s default styling. Customized changes get applied through a different mechanism. These are often stored under the active theme’s name. When you activate a child theme, the data stored under the parent name is no longer accessible since the child is now the active theme.

In theory, reapplying the changes through your child will cause the changes to be saved under the child name. You could possibly have a number of child themes, each with their own custom settings. Switching between them would activate the respective settings saved under each version.

How you could get your child to retrieve settings saved while the parent was active varies by theme. If you need to do this, I suggest asking in the dedicated support forum for OceanWP.
https://wordpress.org/support/theme/oceanwp/