The new TPP0500B has a newer probe cable that improves the durability of the probe and the probe tips are different. The electrical and mechanical specifications are the same.
The accessories are also the same for the two probes.
013-0362-01 will work with both the TPP0500 and TPP0500B.
013-0707-08 is not compatible with the either. Those are more commonly used with older generation probes such as the P6139A.
If you are interested in placing order or parts pricing, please reach out to our sales at 1.800.833.9200 option 1 or email the request to buy@tektronix.com.