In 2025 tax return, should I use numbers from the original or amended 2024 return if 2024 amendmend is not accepted yet?

Use the correct numbers, i.e. the values you're reporting on the amended return.

If the IRS questions you about the discrepancy, simply tell them that the original numbers were wrong and you've already submitted an amended return to correct them. They'll be able to confirm this and there shouldn't be a problem.

And if it doesn't affect your 2025 tax, it's not likely to be an issue in the first place. It doesn't have any effect until your 2026 return, by which time they'll have processed the amended 2024 return so nothing will look wrong.