2 Answers

Here is one view :

..................strategic thinking and planning are “distinct, but interrelated and complementary thought processes” that must sustain and support one another for effective strategic management. Graetz's model holds that the role of strategic thinking is "to seek innovation and imagine new and very different futures that may lead the company to redefine its core strategies and even its industry". Strategic planning's role is "to realise and to support strategies developed through the strategic thinking process and to integrate these back into the business". 

For more on this click >>>  Strategic thinking  

Strategic thinking is when your ideas can solve a question or problem.  Strategic planning is basically having a problem or situation in which you compose an answer.