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I have seen similar looking Trilobites from China listed as Illaenula vietnamica & Ductina vietnamica (on different websites) Are both these names the same species?

I received this as part of my TFF secret santa gift. Santa only had the genus name and no other info. Can you help narrow down a species? I am thinking Ductina ductifrons?

Hello All, I’ve acquired some specimens of the species Ductina vietnamica, a blind phacopid trilobite from the Devonian of China and Vietnam. These specimens, dating to the Eifelian age of China, are fairly well preserved for the often-flattened and disarticulated type. Ductina was a rather successful phacopid, being recorded throughout most of the Devonian. They are small (my examples range between 1/2 an inch to 1.2 inches), with a simple effaced pygidum and a cephalon lacking many features (such as tubercles) found in its fellow trilobites of the Family Phacopidae. Most noticeably, Ductina is blind. Blindness is a trend in several groups of trilobites, but was also present in the relatives of the well-known Eldredgeops. This secondary blindness has often been interpreted as relating to the environmental conditions that the benthic trilobites faced (Clarkson, 1967). Taxonomy: Class: Trilobita Order: Phacopida Suborder: Phacopina Superfamily: Phacopoidea Family: Phacopidae Genus: Ductina Species: D. vietnamica Location Information: Country: China Province: Guangxi Formation: Unknown Here are some photos showing the details: A photo of the most complete specimen. There is some damage on the fragile pleurae, but for the most part, it is complete. This one is about 3/4 of an inch long. Close-up of the glabella and thorax of a red example. This one shows glabellar furrows that are absent in many examples. The pleurae are also in good shape. Citations: Clarkson, Euan. (1967). Environmental significance of eye reduction in trilobites and Recent arthropods. Marine Geology - MAR GEOLOGY. 5. 367-375. 10.1016/0025-3227(67)90046-1.

I just acquired these trilos from China, just wanted to make sure the names/locations are correct as I have seen it vary between sellers... Ductina vietnamica - Devonian: Famennian (according to Sepkoski) - Mountains of W. Guangxi, China -also curious what those little spike or cone shaped bits are that surround the trilo and in fact fill the shale in the one piece at least! (trilo is about 34mm long) Coronocephalina jastrowi, Silurian: Wenlockian (Sepkoski) - Mtns of W. Hunan, China (have also seen Hubei and Henan, and the genus name Coronocephalus but maybe that's for the other species) ?? - length ~5.5cm

Okay. So today I decided to expand my trilobite collection to all kinds of countries. North America, check. Africa, check. Asia, no. Now, I must find an Asian trilobite! So one of the trilobite species I know about is Ductina vietnamica. eBay seemed like a good place so I search it. I find Ductina vietnamica for only $12! These trilobites are found in China and I have had a bad experience with Chinese fossils (as a kid, I found one of my Chinese fish fossils to be a fake!) Due to my experience, I immediately start doubting if this is real. It's only $12! Here are some pictures of the eBay listings and you can see the prices. Any suggestions on whether it's the real deal?