Yeah, that's the 43S423, the warehouse club version of the 43S425, so the same TV, with maybe a tiny cosmetic difference, e.g. stand color. I asked at Amazon a question pertaining to the 43S425:
I this an improvement on the TCL 43S405 or is it really the same TV?
TCL Support responded:
The new 2018 versions of 4-Series TVs offer the same great performance and features as 2017 versions. The new models offer a refreshed bezel and stand design, but features and capabilities are identical. Thank you, TCL Customer Support
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So, you can save yourself some bucks by just buying the 2017 model. Both are available at Costco right now but the 2017 model is $20 cheaper. I like that I can pick it up myself, saving having to fret about untrustworthy delivery services, not to mention needing to sign for it. Plus Costco extends the warranty.