Yamaha DTXpress/DTXplorer/DTXtreme

Dear group,

I have the original DTXpress with 5 x TP60 and 2 x PCY80. I'd like to 
upgrade it with some dual-zone pads. I have some questions about this:

First for the snare: TP65S or TP80S? What's the difference?
I'd also like to have a PCY80S or PCY65S. Again, what's the difference?
Do these pads include a cable or do I have to order this separately?
Any gotcha's I should be aware of?

Can I still use my old TP60 and PCY80 that will be left over? Perhaps with 
a splitter on input 9/10? Are CYAT80 and TPCL80 the correct holders to order?

Lots of questions, thanks for taking the time!
Ben