its not going to cause damage if you put some 95 in. yes if you are remapped based on 98+ its going to reduce performance and the ECU will pull things back a bit.
but don't overestimate this effect.
Incidentally, the manual may list 98 - and thus they can use this for power figures etc.
But you can use 95, its within the range thats listed, but it does say you may see less performance. its not dangerous, its just about official power and emission figures they state to use 98
before anyone says why have a nice car and put poor fuel in, - i'm not telling anyone what to do, we are all adults so can and will make our own minds up. some people drive cars hard and pursue every last bit of performance, while others like to drive nice cars but don't drive them hard 99% of the time.