As you can see, these are two totally different sized planes.

The Cap-X retails for $379 at chiphyde.com

Chip Hyde Cap-X
Wingspan: 74"
Length: 69"
Area: Approx. 1050 sq. in.
Weight: 10.5-??? lbs (note)
Engine: 1.6 c.i. - 50cc gas

Great Planes Matt Chapman Cap 580
Wingspan: 55.5" (1410mm)
Wing Area: 562.5 sq in (36.3 sq dm)
Weight: 6.75-7.5lb (3.1-3.4kg)
Wing Loading: 28-30 oz/sq ft (85-92 g/sq dm)
Length: 52.5" (1335mm)
Engine: .46-.61 cu in (7.5-10cc) 2-stroke OR
.52-.70 cu in (8.5-11.5cc) 4-stroke