Help: How to compare 2 rows?

I need some help, but first i am going to show how the workflow was made:
1- The workflow reads the data from the text file containing the following lines:
“ABCDEFGHIJKLM”.

2- The workflow reads the data from the text file containing the following lines:
“1234567890B”

But i don’t know how to compare these 2 rows and separate the duplicated rows into a new file
Can you help me?
(I tried to compare using the merge rows step,parameters,separated workflows, all you could imagine.)
Thank you
(If you need some screenshots, contact me)

Hi VitorSampaio
You can use stream lookup to get matching field then you can use data validator or filter whichever you want to get the duplicate or single entry rows. i may upload a video ASAP for the same.

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Thank you for your help.