Hi!
I'm pretty sure Ashley Greenup is the author and Dee-Kay the publisher of the first entry, they both worked in very similar titles like
https://spectrumcomputing.co.uk/entry/1 ... /RTC_Crewe
The second entry must be the same software, but self-published by Greenup. There is an Amstrad CPC version that has no mention of Dee-Kay and looks like it is the same software
https://www.cpc-power.com/index.php?pag ... l&num=3610, also, presentation matches other self-published titles by Ashley Greenup
https://spectrumcomputing.co.uk/entry/1 ... sbury_Park so, pretty sure this is the CPC verison of the missing software.
So, in the case of the Dee-Kay published software, we can add Ashley Greenup as the author.
On the Ashley Greenup entry, we can add the Amstrad CPC version, Spectrum version is sadly still MIA.
We are not 100% sure about which software was derived from which, but we can add notes stating that they both looks like the same software with some changes.
EDIT: forgot to mention, about the software derivation information, the Dee-Kay version has no date, but the Commodore 64 site says 1988, and the Ashley Greenup CPC version states 1989 in the screenshoot, so, looks like the Dee-Kay version was first, but of course, we can't trust 100% these values.