Yes, the Porter (DD800) was a square-bridge Fletcher. Either of the two kits you suggest would be a starting point for the subject.
In addition, in 1:350 scale you could go with the Trumpeter "The Sullivans". It has a few issues but would make into your subject without any extra conversions.
In 1:700 scale you coulsd also check the Trumpeter Sullivans. It's quality is better than its 1:350 cousin, probably since it was actually made by PitRoad. PitRoad also sells a USS Callaghan under their own label.
And since bigger is better, Iron Shipwright makes a square-bridge Fletcher in 1:192 scale resin & brass as the Johnston.