My bike has over 2100 miles (in one year

) I took it to my local bike shop and they said my chain was stretched out. I had them swap it out with a new one and they put a SRAM PG-1030 11-26T in place of the original Shimano 10Spd (HG500) Tiagra 4700 Cassette 12-28. Will there be much of a difference? Thanks.