The five series were instituted as part of the Clone Saga after when Peter Parker gave up being Spider-Man to retire with his pregnant wife Mary Jane, and the Scarlet Spider took on his duties. Amazing (along with Spider-Man, Spectacular and Unlimited) returned to its old name and numbering when Ben Reilly left the Scarlet Spider identity behind and took on the Spider-Man name for himself.
The Scarlet Spider books were direct continuations, in terms of creative teams and story lines, of their Spider-Man counterparts. They were effectively temporary renamings of their counterparts, other than not being incorporated into their issue numbering. The writer of the two issues was Tom DeFalco and the penciller was Mark Bagley.
Both issues are collected in Spider-Man: The Complete Ben Reilly Epic Book 1.