The offspring of the hydra and the salamander would not be genetically identical to their parents. This is because hydra and salamanders belong to different taxonomic groups (phylum Cnidaria for Hydra and class Amphibia for Salamander) with vastly different genetic makeups.
Moreover, sexual reproduction involves combining half of each parent's genetic information to create a unique set of genes in the offspring. Since hydras reproduce through budding (where an individual can produce genetically identical clones), they do not undergo sexual reproduction. On the other hand, salamanders reproduce sexually, so their offspring receive a unique combination of genes from both parents.
Therefore, even if it were possible for a hybridization event between these two organisms to occur (which is highly unlikely due to their biological differences), their offspring would inherit new combinations of genes that are distinct from those found in either parent species; thus making them not genetically identical but rather hybrids with unique genome arrangements reflecting characteristics from both lineages.