It sounds like the gain on your house is not taxable, since it is under that tax-free portion of $500,000 (joint return) or $250,000 (single). If so, then your tax should not change when you file the amended return.
I'm not sure why the tax due has changed, but it may not be necessary to file the amended return if your tax will not change. You are not required to report the sale of your primary residence if you have no taxable gain to report on its sale.
The worse that could happen to you is you will get a notice from the IRS about it, to which you can respond that it is not at taxable, so that is why you did not report it.
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