Rise time different from fall time; relationship differs between AND and XOR gates
The "typical" timing values given in the datasheet are usually not very helpful. You should be looking at the maximum timing values. Furthermore, the data sheet is not saying that the rise and fall time are the same...it is saying that both timing values are guaranteed to be less than the specified maximum (200ns). There is also no specification that tells you that the rise time will be less than the fall time, or vice versa.

The timing values you observe in an actual circuit may also be different for the various input transitions that can cause the output to change. The delays may be different for different manufacturers, or for the same manufacturer but parts manufactured on different days. The only thing you can count on is that the observed transition times and propagation delays will not exceed the maximum specified values.