Both are low res, but the one in Unreal seams to be set to filter using nearest neighbor. If you double click your texture in Unreal expand the texture tab and its sub tab with the little white arrow at the bottom. at the bottom of the sub tab you will find “Filter”. Set this to “default (from texture group)”. If this is already the case make sure your texture group (Level of Detail tab, at the top) is set to “World”, or maybe “Character” if it is for a character.
Make sure your textures are always a power of 2 (2, 4, 8, 16, 64, 128, 256, 512, 1024 etc…) and it generates mip maps.
Ah alright. Though I did texture this in 4k. Well, there is only one 4k map on that model. Is the results I’m seeing in substance supposed to be different from the ones I’m seeing from my renders?