I don’t know exactly, but afaik the only difference of FP1/FP1U is another version of the MTK chipset…
All other components should be the same!
Did you order the replacement set via the FP shop and did you have choosen “FP1” there?
If then FP1U display was sent I think everything is fine, as they are identically…
But maybe anybode can confirm this?
Cheers, Robert