Early version at left; later version at right has different wheels and a revised base (see below).
Toy size
Length
Width
- early version
- late version
Height
(incl radar dish)
98 mm
79 mm
81 mm
54 mm
3 7/8 in
3 1/8 in
3 3/16 in
2 1/8 in
The most tell-tale differences are that the Roxy copy has more and more pronounced ribs on the top cone of its body, with courser pebbling around it. But all other details are also different in dimensions/thickness to some degree.
Markings
Above left: Early Roxy version
Above right: Later Roxy version
Left: Spacex Prospector