I personally didn’t try Wenatchee Moorpark, but according to David Karp (a well known California fruit writer), it’s inferior to the real thing:
“Moorparks at Southern California markets are often Wenatchee Moorpark, a different and inferior variety.”
All fruit books (Hogg, Hedryck, Wickson, etc.) emphasize tenderness and irregular bearing of Moorpark; Hogg has a full paragraph devoted to winter tenderness of Moorpark trees.
Uneven fruit ripening is also a well known issue of Moorpark, but its severity depends on the climate. Wickson wrote in the early 20th century:
“In some parts of the Santa Clara Valley the Moorpark seems to ripen uniformly. The same behavior is reported from the upper San Joaquin Valley, where it also seems to be a more regular bearer. The variety is almost wholly rejected in So. Calif.”
I notice on my Moorpark tree that the fruit that ripen early in the season tend to ripen unevenly, but ripening becomes more uniform as the harvest season progresses.