Hey there! It should import fine, just drag the fbx to the project files like normal and if you want the pixelated look double click the png and change the texture filter to nearest:
If you need any assistance besides that let me know
It's that "should" that's been my wrongest assumption when importing FBX sets in Unreal 5.3 😂 (and that's after working in Unity/gamedev for a decade). I'll give it a go ^^