Despite the difference in size between the 101 Reverb and the 202 heads (Tone Block 202 and OverDrive 202), both 202 heads will fit in the back of the 10TC cabinet.
However, since you are running a 200 watt head against a 100 watt cabinet, the 202 head must be ran with a reduced master volume. We'd recommend setting the master to 70% at the highest, to ensure you do not blow out the speaker. More info on this can be found here.