Yes and yes. The diameter is what matters when you lock in 4x4, they have to me rotating at the same rate or you'll mess some stuff up.
It's better to have all the same size so you can rotate then all out and maintain a consistent circumference, but where you're at should be fine if your 4x4 usage is minimal (stuck in the mud, yanking something out). That small of a difference wouldn't have an effect unless your rolling 55 for a long period of time in snow or mud/slush.
2 cents
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