The problem is that this ATL Amazon is at a higher latitude than OTL, right in the middle of the Hadley Cell. As such, it will be dry, simply because of teh way climate works.
Conversely, this ATL Sahara will be quite a bit wetter than OTL, because it sits on the equator. Conversely, the Congo will likely be a desert (and the fertile southern tip will be quite a bit bigger; Namibia will almost certainly be potential farmland, not desert). This Sahara won't be as wet as the Amazon though, because it doesn't have a mountain range to break the raincloud.
How civilisation develops depends a huge amount on whether humanity evolves in the western continent-pair or in the "old world" region.