Difference between Cash in on something and Cash in something

cash in on something—

1. make a profit on smth.:

• Steve cashed in on the farmland he picked up dirt-cheap.

2. take advantage of smth.:

• Japan’s diplomats are now trying to “cash in on” the opportunities which its soldiers have created.

cash in something—exchange smth. for the amount of money it is worth:

• The shares were cashed in to help buy my London house.