Heater switch. Which is which?

So I was looking at some of my heater controls and noticed a difference in switches. The switch on the left had a part # starting 27... the right 28... I'm thinking the left switch is a 67 and the right a 68 to 70, 71? Anyone know for sure.ThanksView attachment 1715725922

My 73 Swinger has the switch on the left, and the Wife’s 72 swinger has the switch on the right.
Best I got.:D