Will you notice a difference? Probably.
I just replaced a 12-25 with an 11-28 on my training bike. On last Saturday's ride there were a couple hills where I was now able to keep my cadence slightly higher. However, at the expense of a little speed. So, less low rpm/high resistance leg fatigue and delayed unset of cramp, but, a slight reduction in climbing speed.
Give it a try and see if you appreciate the lower gear more than the additional 2 tooth gap in the middle of the range. Not much to loose.
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Birth Certificate, Passport, Marriage License Driver's License and Residency Permit all say I'm a Fred. I guess there's no denying it.