Can I feed this to aquatic newts?

[Miriam Kerens]

I've bought four cans of dead food for my Ambystoma opacums to feed them when live food is getting rare in the colder time of the year, they have learned to take it. It's food in one piece that is conserved in it's one juices in such a matter that it doesn't lose too much nutrients. It also looks very juicy. I have bought crickets, grasshoppers, snails and catterpillars. But what I was wondering. Is it possible to feed one of these to my aquatic newts as a variation of their diet as well? Or are there any that they won't be able to digest (such as mealworms) or will get them ill? I have several Cynops-species and Pleurodeles waltl, they all take dead food.