I can't comment on these specific airfields, but I have seen this at others. In many cases it included ILS U-V-W - X-Y-Z. It depended on the full procedure (even with radar, but it is there for the failure case) and the entry point into the procedure. There were also airfields that used the same entry point, but the ILS ID depended on the G/A routing. In the first case it was obvious which to select, but in the latter you had to confirm the ILS ID before approach. Of course you had already made a guess before TOD and it was a pain if at the IAF you were notified of a change. That is when you found out who needed an FMS or not.
When the less experienced, more computer savy pilot, went straight into the FMC when concentration should have been elsewhere. I asked the question about the NAV Aid back up they had already selected and why. "Because it is an SOP, and to allow raw data navigation in case of FMC failure, I suppose." "In that case why not just change the NAV Aid selection to suit the new G/A routing and use HDG SEL? The Wx is fine; do you expect to make a G/A?" "No", & " Oh yeah, that's an idea."