there are a number of risks associated with feeding pollen/pollen substitute patties to bees and the biggest one typically encountered is the population explosion that occurs with Small Hive Beetles that are very rapidly attracted to these patties. I flag this as this a common experience with the beetles making more out of the patty feeding than the bees.
Also, egg protein used in bee feeds has been shown to hurt more than help, this is because the egg white contains avidin, a protein that binds biotin and makes it unavailable to the developing larva. Biotin is a vitamin B complex that is essential for growth and development in animals and insects. Several studies have been done where egg products were put into insect diets and they either slowed or stopped their growth all together.
So, multicoloured pollen that your bees have previously collected is best but remember make sure its from your own from healthy hives to avoid the risk of AFB and the like.
And if you think the risk of AFB from feeding pollen from hives that aren’t yours give the following article a read, it certainly highlights how it can all go horribly wrong if you buy pollen that isn’t irradiated first.