Bearing in mind that the profile is a percentage of the tyre width, there is very little difference in the width of the two. 65% of 225 is 145.25 compared with 70% of 215 which is 150.5
By my rough calculations, the circumference of the 225/65 will be about 98.5% of that of the 215/70
I have 215/70 tyres and my speedometer over reads by about 4% so the difference would be favourable for me. I would be more worried about the wider front tyres being too wide on full lock and coming into contact with something that they should not.
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