Yep, they are roughly the same.
'Get talking' is more of an order. Someone is refusing to talk, you are telling them they must start talking
'Let's talk' more of a strong suggestion. Let us talk / i suggest we both talk (perhaps privately)
October 3, 2013
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For my simple understanding.
Get talking means your asking someone to talk while 'let's talk' (took out the 'ing') means you want to talk to someone.
October 3, 2013
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