You could use Update (Analysis)—ArcGIS Pro | Documentation.
Input Features: Shapefile 1
Update Features: Shapefile 2
Note:
- The input feature class and update feature class field names must match. If the update feature class is missing one or more of the fields that are present in the input feature class, the input feature class field value for the missing fields will be removed from the output feature class.
- This tool may generate multipart features in the output even if all inputs were single part. If multipart features are not desired, use the Multipart to Singlepart tool on the output feature class.
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