The IDs used for groups, fields are generated using uniqid() https://www.php.net/manual/en/function.uniqid.php. This function uses the system time to generate an id. Increment any value in the key will not be guaranteed to make it unique. It would be better to append a value to the existing key, for example
layout_5cc01670...a
layout_5cc01670...b
layout_5cc01670...c
as far as searching and replacing, that would depend on what you are searching and replacing? I don’t know anything about how WPML translates a field group, so I’m not sure I could help you with that.
