No, I'm sure it was the base sensitivity that was 1.3% lower (not the actual sensitivity, it will vary slightly), so it was a tiny difference (I still have the old entry available). Also note that a multiplier doesn't make sense in Minecraft. Let's say your sensitivity is 0%, multiplying that by any number still gives you 0. Just like 0.1 is not half the sensitivity of 0.2, it scales completely different than that. Half of 0.2 is actually 0.08997361.
Did you try the sensitivity matcher program?