To begin with, and from a pure usability perspective, I would be reluctant to include two icons that so similar and could be unclear for many users. What's wrong with 'Done' and 'Del'?
Then, my take on this is that you should adhere to the platform guidelines on which the application will run (see this question for more).
Microsoft's guidelines are that the primary action is left-aligned. Whereas Apple's guidelines are that the primary action should be right-aligned.
So assuming that Enter is the primary action, and the device runs on iOS, the Enter should be on the right.