Ferns tend to stick to their own kind. Hybrids between species within a fern group are possible but uncommon, even in nurseries. Crosses between the groups or genera- such as the Matteuccia, Ostrich ferns, and the Athyriums, painted ferns- are unlikely. You can plant your ferns together and they will maintain their distinct identities. However, if you plant several different color varieties of painted fern, you may end up with some new color combinations. That could be interesting!