Porsche Design by IWC Chronograph Moonphase Variations

What are the differences between the "Titan" signed 3742 and the non-signed
3745? Which is earlier? What is the timeline? What is the proper caseback?
Thank you!

The bracelet makes the difference.

The early 3742 has links with two silver pins and the engraved caseback.

The last version 3745 has sleeve and needle links.

Amazing! Thank you for getting back to me. I was wondering about examples like
these which have the Titan signed bracelet but do not have the same dial
variation as the 3742 (with the IWC and Porsche Design at 12) instead having
Porsche Design at 12 and by IWC at 7.