Tyre help please.

[darrsi]

Matching tyres are exaclty that - matching. They have been designed to work together optimally. 

That said, I don't think that mixing them up would make that much difference to most people and/or normal road riding.  Track days or overriding for conditions and it may be more noticeable.

Ultimately, it's up to you. If you are happy and comfortable mixing them, then go for it.  If you'd prefer matching, then you'll have to pay more to change them both.

They may be classed as matched by the manufacturers, but it's the reviews I take notice of.
On my last bike I had a tyre on the rear which had positive high reviews but the matching front got terrible reviews, from wearing unevenly to being shite in wet weather, and it was consistent wherever I looked.
So it makes sense to me to buy tyres which have individual higher reviews and are a good all rounder, regardless of whether they end up being matched or not.
Always worked well for me.