How important is it for user-agent OS to match TCP/IP fingerprint OS?

Jetnyj

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When setting up antidetect/browser profiles with proxies, you end up with two separate signals:
• The user-agent string (which usually encodes browser + OS)
• The TCP/IP fingerprint OS (from stack signatures, TTL, window size, etc.)

How strict do platforms/websites get about these needing to align?
For example, if the profile’s user-agent shows Windows 10 Chrome, but the TCP/IP fingerprint points to Android, is that a red flag in practice? Or are mismatches tolerated/ignored unless you’re doing something really suspicious?

Curious what people’s experience/tests say here.
 
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