Question

how do nutritional values of fertilised and unfertilised eggs differ​

Answer 1

As for its nutritional value, the issue whether fertile chicken eggs are healthier than unfertilized eggs remains up to this day a highly debatable one. If you want to get the most of the egg's nutrients, go for the freshest eggs available. The longer eggs are kept, the more their protein content gets lost.

Answer 2

Is there any difference in the nutritional value of fertilized and unfertilized eggs?

As for its nutritional value, the issue whether fertile chicken eggs are healthier than unfertilized eggs remains up to this day a highly debatable one. If you want to get the most of the egg's nutrients, go for the freshest eggs available. The longer eggs are kept, the more their protein content gets lost.