Thunderbolt 2/3

[Tigercubrider]

my new Mac is thunderbolt 3
I have a thunderbolt 2 device and lead
Are all th2/3 leads the same?

Or do some work one way only or only work as display etc?
They are expensive to buy to try

 

[foxhole]

You mean like this?
http://www.jigsaw24.com/apple bi-di...nderbolt 2 adapter/cables/-/fcp-product/33585

they are bi-directional.