I think the reason they that CBSTVD/Sony is so strict about Wheel, when compared to Jeopardy is the fact that Wheel of Fortune started as a daytime show on NBC, and the original contracts were written to protect the versions from clashing with each other.
Although the Network version of Wheel of Fortune hasn't been on air for over 30 years, they most likely kept the language in the Wheel contract to limit the timeslots which it can be aired (either out of laziness, or the fact that because of essentially being limited to prime access is why the show skyrocketed in popularity), and is likely why the Saturday rerun slot was created for the show, to give affiliates the ability to air shows preempted earlier in the week.
The current version of Jeopardy started out as a syndicated program, and since there wasn't a related network version on air, the distributors let affiliates show Jeopardy in any slot.
That, combined with the aforementioned returning champions, and the fact an repeat block was created for daytime, is why affiliates are able to air Jeopardy at any other time if preempted, and why 99% of the time Jeopardy is given higher priority over Wheel, even when Wheel has slightly better ratings.