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Oh ok, are those columns same but just had different names? If there are fewer columns and you want to do it quick you can rename using rename operator just for this process.
If your columns are really the same (same data type, same order) but just have different names, you can easily use Rename by Generic Names operator on both datasets and then proceed.
If you are looking to compare two datasets, please see attached thread where it was discussed.
https://community.rapidminer.com/discussion/50192/comparing-two-sets-of-data
Thanks