Consider the following passages:
A litter made of two rifles and two field jackets would suffice for now. That was good news; another bit was that the EPW was a lieutenant, a regimental REMF attached to a battalion quartered in town. --Rangers Lead the Way By Thomas H. Taylor, Robert J. Martin
He had a couple of thousand dollars on him that would suffice for the time being, until he could find some kind of legal employment. He got out ofthe car, and walked a block. --The Maze By Kahn Morris
Now, how are these expressions different? Could we use them interchangeably? Oxford Dictionary of English has the following definitions for them,
for now until a later time: that's all the news there is for now;
for the time being for the present; until some other arrangement is made.