As mentioned already by Kevin, they both have the same meaning. Your first sentence however is written wrong. WRONG ---->> let's get started our work RIGHT --->> Let's get our work started. RIGHT --->> Let's start our work. RIGHT --->> Le'ts get to work. RIGHT --->> Let's get started.

*Let's get our work started They both mean basically the same thing. If there is any difference, there might be more of an emphasis on the first that focuses on the people as being the important factor in the sentence. The second focuses on the work more. However, in spoken English, it would depend on your intonation. I hope that this helps. Keep learning!