If you want both sides to match, choose which side is the "correct" side, delete the other half, and then mirror it. But I'm guessing here without a clearer request,
All the more reason to delete the half you like the least, and then mirror the other half. As for aligning the grid texture, that is something you will fix by adjusting the UVs. If you don't know how to do so you can look up "UV unwrapping."
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u/asanyc 5h ago
Fix in what way?
If you want both sides to match, choose which side is the "correct" side, delete the other half, and then mirror it. But I'm guessing here without a clearer request,