Nope, the Mac KNOWS in which slot the DeclROM/Card resides by its reply when that interrupt/Slot ID is polled by the Slot Manager at startup.

Just because only $E is available on the LC Series, doesn't mean the card would know if it had been piped another interrupt, an interrupt is an interrupt, only the OS needs to keep which one is for what straight. A NuBus Card and its DeclROM don't care in which PseudoSlot Address they're dumped, they just need to respond when that particular chain is pulled. LC Cards are likely only set up for $E because that's all LCs have . . .

. . . until Herr Braun gets aholda' them. }