Not only did the Republican primary outvote the Democratic primary for the first time (ever?), it wasn't even close, about 57/43. Very similar to what we saw in West Virginia last week.
Compared to 2020
Republicans: 414K --> 385K (-7%)
Democrats: 544K --> 292K (-46%)
The numbers for 2022 will be slightly greater than those above, but the difference is stark, and noteworthy. Kentucky still has a closed primary, so conservatives who are registered Democrats still inflate Democratic numbers in primaries, and you can see it many historically Dem counties.
Which is also why I'm wary about pointing to crossover voters in exit polls.
Sure, you have voters who usually align with one party deciding to cross-over. But there's definitely voters who just haven't bothered to change their registrations (e.g. old-guard Appalachian Democrats).
