First though, this is an idea of the size of the sample I've been working from, these were actually the ones in storage, and others were here, while a few more have come in recently, but you can see that the main 'types' we will be looking at (Giant, C1, C2 and C3) are all represented in largish quantities except the Giant originals (bottom-right, nearly empty pack) which were mostly here already! Silver predominates, but as the 'C2' we also get gold, scarlet and metallic blue & maroon figures, while . . . hold on! This is all for the next image; Right . . . Silver plastic predominates, but the C2's were also done as gold, scarlet (not shown here, but peeking in the first image - above)) and metallic blue & maroon figures, while as C3 we sometimes find painted figures, a finish which may be of factory origin.
The C1 may not be the first copy, but is
the best so earned it's moniker by dint of being closest to Giant's issues,
while the C2 was by far and away the commonest, and the C3 is a separate issue, possibly (and only possibly) copied from the C2's as a third-generation piracy, on their post I will look at this further.
I don't have a Giant set yet, so this toy house one will have to do, but we looked at them all recently here;
Giant OriginalsToy House Issue
Dodgy Copies
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But is it Giant?
The figures in the bottom right-hand bag of the first image and the figure (3 angles) in the left-hand column of the second image are Giant product, everything else (99%) is not. The third image is dealt with on the relevant post (second link above).