Sorry, I found out there is a better subforum for my topic after I posted it already and I wasn t able to delete it.
I don t mind slight drop in accuracy and drop in bandwidth. And I don t mind the lower current rating and smaller dimensions of switch because I wouldn t measure currents higher than 200mA.
I contacted RS Components, Digi key and mouser customer support and EVERYONE told me they are the same switches (working principle) and even when I showed them schematic of uCurrent rev 5 they told me to go ahead and that I could switch them without changing pin order.
I ve done my research and I will be posting it below.
So there is actually two types of DP3T switches and it seems no one recognizes the difference.
1. DP3T WITH common pin is described as having 2 inputs and 6 outputs that are divided between two switches that are operated with one slider. Those 2 switches don t have any electrical contacts in any position of operation so we can say that DP3T has 2 galvanically separated switches with each having 1 input and 3 outputs.
2.DP3T WITHOUT common pin is almost the same as above but with one main change. There is no common pin in three positions of operation. Each position connects 2 neighboring pins. Example, one side of switch has 4 pins from 1 to 4, with three possible positions connecting pins 12 in positions 1, connecting pins 23 in positions 2 and connecting pins 34 in positions 3
I hope this saves time for someone that stumbles upon the same problem.