There are 2 different issues. The first being does it fit at all. If it actually touches the fan then something can get damaged.
The second is how much does it block the air flow. That topic is more for a fluid dynamics engineer to know. But basically if you were to have say a flat piece of plastic close the air be partially blocked. But it depends on some many variable, when you consider they have special fans that are best placed with no gap say on a radiator to help force air though.
I think this is almost a none question if you do not have issues with what appears to be about $10 US between the cases. The video card will have no issue fitting in the second case and you get more fans.
Front: 3×120mm Rear: 1×140mm
The first case only has
Front: 1x120mm Rear 1x120mm
You would have to look up reviews on the cases to see if there are any strange issues.