TE0300-00 has a 50MHz secondary clock, whereas TE0300-01 has a 125MHz secondary clock.
Contact 14 of connector J5 has been extended from an input in TE0300-00 to an I/O in TE0300-01. Therefore hardware designs developed for the TE0300-00 are compatible with the TE0300-01 whereas those developed for the TE0300-01 are compatible with the TE0300-00 if that contact is configured as input.
Contact 76 of connector J5 has mistakenly been described as I/O in TE0300-00, but it has always been an input-only contact as documented for TE0300-01.
Connector J4 has not been changed.
With TE0300-00, the LED is lit when the U_LED line on pin T15 is set high whereas with TE0300-01 the LED is lit when the U_LED line on pin R10 is set high.