Clint your NHN offsets will probably outlast the larger rosettes in the Lowe's pot. Those rosettes are already older than the youngsters from NHN. The young ones just starting to make roots will assure you of having them around longer.
Many of the nurseries have had to increase their prices because of the postage increase. Your new NHN offsets look great and will soon produce a nice, large root system. And probably start producing new offsets this year. Give them a chance.