In a recipe it should work. Most recipes, when mentioning eggs, mean large eggs as these are the most common. Unless the recipe is very precise on the type of eggs, adding 4 medium will not affect it too much.
About 5.6 large eggs equal 8 small eggs
4 large is 210 gm. 3 extra large is 206 gm
3 or 4 extra large eggs will about equal 5 large eggs.
Four
Large eggs weigh between 2 and 2 1/4 ounces.
Approximately 4 large eggs in a cup
That is approximately 4 large eggs
100 grams of eggs is approximately 2 large eggs.
If they are large eggs that is approximately 24 ounces
4 jumbo eggs = 5 large eggs = 6 medium eggs= 7 small eggs = 1 cup (250 mL) yolks and whites; 1 dozen large ...www.globalgourmet.com/food/resources/eggs.html
Eggs are graded by weight. 1 doz. jumbos equal 30 oz. 1 doz. extra large equal 27 oz. (large = 24 oz., medium = 21 oz., etc...) 4 extra large eggs = 3.6 jumbo eggs. (you may want to use 4 and reduce liquid a little somewhere else)