You should be GTG, but you will need to shoot it to confirm functionality. Swapping buffer weights is likely to be the most that you will need to do, if anything.
I built a carbine lower with three uppers:
• 16" mid-length gas 5.56 NATO
• 12" carbine gas 6.5 Grendel
• 20" rifle gas 6.5 Grendel
Function testing with an H1 buffer, everything was copacetic except for the rifle upper occasionally had a bolt override malfunction. I hypothesized that it might be slightly overgassed and swapped out to an H2 buffer. All three uppers run like scalded cats now.
If you have any issues, step up to the next-heaviest buffer weight and see if that fixes the problem.