What is the CMS software for these types of sites?

[Julessea3]

Hello friends; there are sites like ozhat.com and many others, their themes and colors are the same with each other except for ozhat.com. I thought they might have CMS software like WordPress or Joomla, I looked into it a bit but couldn't find any results. Does anyone know what CMS software the infrastructure of this site might be using? There are many sites engaged in spare parts trading similar to ozhat.com; these sites share all their products with the same product code. As far as I know, they share their products among themselves either as XML, CSV, or database files. How can I find these product files in order to upload them in bulk? Thank you in advance for your help and support...