You give another examples, not for eublepharis.I highly doubt it. I've kept both. The hardwickii look very different and need a different (more humid) environment. Also, you're not talking about sub-species here, you're talking about different species. Eublepharis is the genus and macularius/hardwickii are the species. That said, there have been successful hybridization across species and even across genera in some cases. There has certainly been plenty of breeding true subspecies of E. macularius to the point where most common leopard geckos are probably a mix of these sub-species and the exciting thing these days is to breed "pure" subspecies without crossing. Here's a Gecko Time article about hybridizing crested geckos and chahouas which, ever since crested geckos were re-classified in a different genus, is an example of hybridizing across genera:
Gecko Hybridization - Gecko Time
I’ve been asked to write about a controversial topic in the reptile world-hybrids. I recently purchased a small group of third generation crested gecko x chahoua hybrids, which marks the beginning of my personal experience with gecko hybrids. I’ve kept reptiles for many years and have owned...www.geckotime.com
Aliza