No. Two things to look for tho. (1) Amount/number of seeds per packet.
Many of the cheaper companies put a minimal amount of seeds per packet.
(2). Reputation of the retailer. There are a few out there who tend to
sell older seeds. This is more prevalent in the "heirloom" niche than
with commercial cultivars. Some of the "heirloom" venders are not too
careful about varietal purity either. So you might get something quite
different with different vendors, even when the name and description
are the same. Most major retailers buy thiers seeds from the major seed
producers like Seminis , Rogers, Seeds by Design, Sakata ........