Here are the specs for the 2 planes
Nexstar:
SPECS: Wingspan: 68.75" (1746mm)
Wing Area: 722 sq in (46sq dm)
Weight: 6.5 lb (2930g) ready to fly
Wing Loading: 21 oz/sq ft (63g/sq dm)
Length: 56" (1420mm)
Sig LT-40
SPECS: Wingspan: 70"
Wing area: 900 sq in.
Weight: 5.5 - 6 lbs.
Wing Loading: 14-15 oz/sq ft
Length: 56"
So yes, they are very similar.
Ken