For the Bruce Springsteen show - and most other concerts with a general admission floor - all GA tickets lead to the same general admission floor and the row designation of GA1, GA2, etc. is meaningless.
For many venues, all tickets must have a unique section, row and seat. Therefore, you may see a semi-specific row or seat listed on your ticket or tickets available for sale.
In this case, if you're interested in the general admission floor tickets, opt for the cheapest option.