Embeded data

will it be different for each respondent or will it be the same?

Hello! It depends, but what I would do is: 

Add dynamic embedded data, that is, at the end of the first survey, generate a link to the second survey that includes the integrated data as parameters in the URL (query string). 

Example: https://survey.qualtrics.com/jfe/form/SV_XXXXXXXXXXXXXXX?Campo1=${e://Field/Field1}&Field2=${e://Field/Field2}

In the second survey, you would configure the Survey Flow to capture these values using Embedded Data elements, ensuring that the field names match the URL parameters exactly.
If the field already exists and has a previous value, the value passed by query string will only overwrite it if specified in the URL and in the Survey Flow. If you want to avoid overwriting, you can use conditional logic in the Survey Flow to only assign the value if the field is empty.