yes, the main different is the rear pod. X have a piece of carbon fiber to connect the rear pod together. the XL only connect to one side of the rear pod so you have more space for brushless motor. But to be hornest even the older X have enough space for brushless setup already. The new one just makes it easier.
I think I see some crc tires at cat shop wor. But very expensive...... And cars I think I see the generation X, not sure if they have the XL in stock la......