True that the Performa and LC 475 used the same board as the Quadra 605, but the Macs differed according to their intended markets. Most obviously in their cases, wrongly shown in this instance, which does not show The Feets. You have probably caught up with feets by now, and appreciate that it is an iconic and affectionate shared joke in this Army.

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That link is a picture of a P/LC475. The Quadra 605 has Feets and a flat top, the LC has a slanted top. The boards are identical except for one resistor which is in a different place in the Quadra 605 in order to give a different Gestalt ID (used by software installers to determine the machine they're being installed on).

I'd say it's a matter of personal preference: Do you prefer a flat top (Quadra 605) or a slanted top (P/LC475)?

All the 040 LCs had manual inject drives, the LCII/LCIII were available with auto-inject and manual inject drives at different times during the model runs. The LC had only auto-inject drives but had two floppy bays (on machines with hard drives, the left bay had a cover shim).

The lower base of the LC is different from the rest of the series. The LCII/III/LC475 had the same lower cases, hence the boards could be interchanged. The top covers differed depending on the floppy drive in the machine.