Is there a difference between the DPDT ON-ON-ON and the ON-OFF-ON or are they the same
There is a difference for sure.
a On-Off-On will connect the centre lugs with either side in the On position, but will connect to neither when Off.
A On-On-On switch is often a A-Z-B switch meaning that in A and B it will connect the centre lugs to side A or B. In Z (centre position) it connects one middle lug to side A and the other middle lug to side B.
I'm not sure but I think there are different versions.
the pic below is actually missing pins in the ON-ON-ON graphic. should be 6 pins to and the centre pins are usually not connected, iirc.
(http://www.harmonycentral.com/forum/filedata/fetch?id=31545148)
i see, thank you
http://www.bitcheslovemyswitches.com/#!/DPDT-ON-ON-ON-TOGGLE/p/36073610/category=5324038
Just for a little extra clarity.
Also a great place to order stuff!