1) I installed 4 ea new Whirlpool 700855K switches. (The old switches had INF-240P-871 stamped on them. 700855K was the cross-referenced P/N.)
The installation was easy. There is slight difference in the terminal arrangement: 1) the old switch has raised terminals whereas the new switch has recessed terminals (for safety), and 2) the terminal markings are slightly different: The old switch has L1/L2/P/H1/H2 (5 terminals). The new switch has L1/L2/P/HC/H1(Also five terminals. I saw where one poster said there were 6 terminals on the new switch vs 5 on the old. There are indeed 6 male spade terminals on the new switch, but the terminal for L1 has two spades jumped together; thus only one terminal for L1. Only one of the spades needs to be used.) The connection is as follows (old to new): L1 to L1, L2 to L2, P to P, H1 to HC, and H2 to H1.
I advise to 'tighten' the connections by very slightly crimping the female spades before pushing onto the switch male terminals. This will make a better connection. If the females are in bad shape they should be renewed. Mine were all OK, so I crimped a little as mentioned.
After completion all 4 switches control their respective burners correctly.
2) I also replaced the four knobs w/ Whirlpool P/N WPY700854. The old knobs' numbers had worn off. They fit OK but slightly loose; I put a turn or two of aluminum foil on the switch shafts to give a tighter fit. Then they were fine.
All in all a pretty easy job, and well worth it. The burners all work fine now.