Hi Bobby,
Irrespective of the 4x4 aspect, I was looking at doing something similar with my daughter's 2wd Clio. Two damaged tyres were on it with the other two in good to almost new condition and I wanted to put Cross Climates on to replace the two that were damaged, but the other two were normal Primacy's.
I messaged Michelin and they are really helpful and came back to say that this would not be recommended to mix Cross Climates with two other tyres. They gave a detailed explanation which I do not have to hand sadly, so you could always ask them in the case of your car / tyre size what their comments would be.
As there was a really good offer (with cashback from one of the companies that do this) I bit the bullet and replaced all 4 tyres with the cross climates and will sell on the primacy's on eBay when I get round to it. At least I know she has the best rubber all round for the most risk reduction.
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