If I file an amended return (before the deadline) that reduces my tax liability, do I still need to pay the tax due calculated on the initial return?

Using TurboTax deluxe, I e-filed my tax return with some tax due, which I planned to pay by check before the deadline date.  I subsequently found that I over-stated some capital gains, and amended my return to show the reduced tax liability.  The amended return shows I still owe some taxes, but not as much as the initial return.  Do I still need to pay the taxes due indicated in the initial return?  Or simply pay what the amended return shows is due?