The width between those two tyres in similarly marked sizes will be small enough that I certainly wouldn't worry about it.
Width becomes a meaningful issues when we are talking about say... my Hed3 with a the choice of a 19mm track tubular or a 23mm road tubular... THAT is a meaningful difference for aerodynamics on a wheel which depends on narrow tyres to be quite fast.
End of the day, they are both race tyres. Both will wear quickly - the rear much more quickly than the front. Both grip well, both are decent choices.
Glue them up, worry less :-)