The most accurate response to the question of what would result from eukaryotes coming about due to endosymbiosis is:
similar structures in eukaryotes with slight variations depending on their use
Endosymbiotic theory suggests that eukaryotic cells originated from the engulfing of ancient prokaryotic cells, leading to the development of organelles like mitochondria and chloroplasts. This process would result in similar structures among eukaryotes, but with variations as they adapted to different environments and functions.