https://check.torproject.org/?lang=en_US doesn't seem to check the fingerprint very much. In fact, IceCat's fingerprint is different from Tor Browser. With scripts enabled, it reports a different time zone than TBB, and it reports your actual screen resolution whereas TBB reports the window size (and sizes the window somewhat generically, always at a fixed width). With scripts disabled, it's still not the same, because the two browsers have slightly different values for HTTP_ACCEPT headers.

I checked with the EFF's tool:

https://panopticlick.eff.org/

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