As djnzx48 says, Waiting for Sproggo definitely participated in the 2013 CGC. It's in the blog and I remember reviewing it (and the tedious royal media coverage from the time!)
I'm fairly sure that Speccy Rally did not compete in any CGC. I can't remember if I included that info in ZXDB originally. Yoshiatom did send games of similar quality to the CGC around this time, but I seem to recall Speccy Rally was emailed to me outside of the CGC—that's why it's at my old CGD blog.
In summary:
Waiting for Sproggo - definitely CGC 2013
Speccy Rally - quite sure not CGC at all