Title format for each book in a series

[Tntexas]

In creating a book for a user in another thread, I discovered that the titles for the books are formatted slightly differently. Two questions:

1.) Is that important?
2.) If it is, how should they be formatted?

series in question

[Cait]

1) Yeah, they really aren't correct as they are. It's not super-important that they all match, but some of them look misleading on their own and that's not so good.

2, verbose answer) Well, it looks like the actual title for each book is "Miami Spy Games: Russian Zombie Gun, Part [1-4]". I can't tell from the information given if the series is "Miami Spy Games: Russian Zombie Gun" and "Part X" is the part of the title which is unique to each book -- in which case the title should definitely be "Miami Spy Games: Russian Zombie Gun, Part X" -- or if the series is "Miami Spy Games" and it's going to have some books titled "Russian Zombie Gun, Part [1-N]" and later books titled "[Some other subtitle], Part [1-M]" -- in which case the title would be better as "Russian Zombie Gun, Part X (Miami Spy Games #X)" but is acceptable as "Miami Spy Games: Russian Zombie Gun, Part X".

2, shorter) It should probably be "Miami Spy Games: Russian Zombie Gun, Part X" for each book for now.

[Tntexas]

Cait wrote: "... 2, shorter) It should probably be "Miami Spy Games: Russian Zombie Gun, Part X" for each book for now"

This is what I was thinking, but I wanted an official opinion before I changed it. Thanks!