Actually it was in the 60's and yes the SKB does seem to be a slightly modified version of the Webley 700 .Differences in the ejector trippers and the addition of the single trigger .Also I recall it is stock bolted [could be wrong ] so in affect it is a very different gun , so no parts will be common to both .
From those that I have seen the SKB appears to be a machine made gun not hand finished as the 700 but as to which is a better gun I leave to others to debate .