Make sure the scale, (both X and Y) matches the above face, and also make sure the shift, (both X and Y) also matches the above face; and then they should line up.
I think you can also put your texture tool on "mode: lift+select". Then click the front side of the wall above the wall with the texture problem. After you clicked that wall (so not the wall with the texture problem), you holt 'Alt' and rightclick on the wall with the texture problem. I think they should have the same texture and scale now.
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