decryption problem with enctype 7500

[lily~hashcat]

I try to use cudaHashcat 1.35 to decrypt two hash of the encryption type 7500(kerberos 5 AS-REQ-Pre-Auth etype 23). The first hash(signed as hash1) comes from the hashcat forum and I use the command '$krb5pa$23$user$realm$salt$hash1' to decrypt it. The second hash(signed as hash2 ) comes from my experinment: I use wireshark to get the kerberos 5 AS-REQ pack, then pick up the enc PA-ENC-TIMESTAMP as the second hash. Also, I use the command '$krb5pa$23$user$realm$salt$hash2' to decrypt it. The first hash can be decrypted successfully but  I failed to decrypt the second hash. What should I do?