Two models of TV series UM7300PUA vs UM7300AUE. These are TVs for the USA and Canada. The same series but there are differences in the model number of the letters PUA and AUE. Different letters indicate that TV models have some differences (not significant).
Televisions with the letters AUE, with only two sizes of the diagonal 43UM7300AUE and 55UM7300AUE.
Televisions have a different product code (UPC). And the different letters P and A indicate that there are slight differences on the TV. In this case, the differences in the placement of electronic circuit boards inside the TV. This is noticeable at the location of the power connector. In turn, this suggests the use of different chassis for televisions. Perhaps this is due to the presence of manufactured cases for the models of the previous year, but they install new electronics.
A vs E in the designation (PUA) and (AUE), these are minor design changes. TVs are slightly different shape of the legs to install the TV on a horizontal surface.