Comparing the games, developer names, and publisher for likeness would be more fruitful than to go by likeness by name, don't you think?
In the case of the Furnisses, were those attributes similar or different?
You made up that under your wing bit while writing the post, I think
I would instead argue for splitting up until the MIA pack with this odd duckling is found.
While it's possible that there is a free PD games
pack with 4(?) commercial games+a PD one (I'll be fair tho, maybe an assumption again and nobody can know everything about every game), it just stands out a bit.