So here is the answer to the best of my knowledge, They are definately different things as in reality, Like user85756 mentioned in the comments of the OP Tactical awareness is the ability to play the teams tactics better whether it be on the counter attack or the offside trap, It is akin to the all important positioning stat for strikers but more important for defenders.
Interceptions on the other hand is the defenders ability to actually intercept the ball if he is in the correct position.
The best defender will have a combination of both of these so that the player is in the right position and can execute.
You will find on most forums that the TA stat is largely debateble whether it actually effects ingame play but i have found that defenders with a much higher stat play the offside trap much better than the ones with a low one.
Source for Tactical awareness