2004 Jeep GC tire size question

[crazy charlie]

Bought new, has factory Good year P225 75r 16s on it. Came across same factory tire except it is a P225 70R 16. anything wrong with putting the 70 series into the mix? I have select trac 4x4 so 99.9% of the time it is in 2 wheel drive . Charlie

 

[Alumarine]

Shouldn't be a problem as long as all 4 wheels have the same tires.
Your actual speed will be slightly less than your indicated speedometer speed.