What is the difference between the first issue of spawn(spawn#1) with a bar code and one without?

What is the difference between the first issue of spawn(spawn#1) with a bar code and one without?
im trying to buy a first print issue of this comic but i am confused and worried as to why one has a bar code on the cover and the other doesn’t?

Best answer:

IT probabaly because thier, one isn’t the First printing or its a variant. Some variants and re-printing have Bar Codes on the back.