What is the meaning of carrier out for an IR receiver?
Plainly listed, those two modules are the Learning and Repeater modules. These modules require outputting the entire signal, both the coded pulses and the carrier frequency they are modulated at.

The others strip the modulation and only output the coded pulses, the data.

The normal modules work better with the carrier frequency they are designed for, but they will still be sensitive to some degree to close frequencies. A 38khz module can read 31khz remotes with a lower degree of vision or distance. The error rate can increase though.