Changing nuggets

[Princess and angel]

Hey everyone I’ve recently changed my guinea pigs nuggets I’ve been giving them a little bit of both of the nuggets and I’ve noticed their have been pooping a lot more is this normal or should I stopped giving them the new nuggets (there have been having the pets at home nuggets I was changing them to the grain free ones)

 

[Qualcast&Flymo]

My gut feeling (lol) is that providing the poop is still normal in consistency etc, it isn't a problem.
Probably the grain free nuggets have much more (good) indigestible fibre which is what their guts need and which passes through their digestive system, and much less digestible carbohydrates etc that doesn't come out the other end.