265/75/R16 BFG MT for 265/70/R16 BFG AT

[TASR12]

I've got a BFG MT KM 265/75/R16 that I used to have as a spare although there is still loads of tread left.

If any one has a BFG AT in 265/70/R16 (I've just put 4 new on) in decent enough shape for the spare then I'd be keen to swap.

I would stick the MT on as a spare but would one tyre @ 75 throw everything off?

Thanks,

Tom.