Partstech feels a bit like Espares in the UK (who have been operating for many years now).
Espares is parts for white goods repair, not automotive, and is B2C and “professional” B2B (selling to independent repair people). Espares holds some stock (1P) but does a lot of dropshipping, mainly from manufacturers like Electrolux. They hold a compatibility catalogue from manufacturers (you put in the serial number or detailed model number of your appliance, and it will filter the available parts for compatibility).
(Yes, I have done some of my own appliance repairs, often starting on espares to validate compatibility then off to eBay, Amazon, or others for competitive pricing or availability. My greatest success was a 4 hour mission to replace heater/sensor block on a dishwasher)