Employers will only look at a 2.1 or a 1st - they won't see the 1% so yes, it will make a difference, but only a small one. A 2.1 is still a good degree.
In most universities a first is 70% and if you get put up to a 1st from a 68% onwards, you should consider yourself very lucky. If universities inflate grades in this way, they are usually only doing it to make themselves look better.