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Each series builds on each other. Both Series feature a Roku Operating System. The 43 inch 3-Series has a 1080p resolution, while the 4-Series has a 4K resolution, HDR10 Support, etc. You can also visit www.tclusa.com/products/home-theater/4-series and scroll down to "Compare All Models" to see all models compared. Hope this helps! Thank you, TCL Customer Support
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