Hi

I'm looking to upgrade my current crank which is a SRAM VIA 48-32 double.

I've found a X0 GXP Double Crankset which is a 42-28T.

It looks like I can make the small ring into a 30T with this.
Blackspire SuperPro Chainring - SRAM XX-XO-X9-X7 | Chain Reaction Cycles

This is the gearing difference

Anyway I can get the XO crank upto 48-32?
Also would I notice a change from 28T to 30T?

Many Thanks