This is not advice. I am not a medical professional, you should speak to your regular healthcare provider for such guidance.
In terms of travel, the topic of COVID, restrictions, testing, and now vaccination regimes all seem to be adding more confusion than ever before.
It doesn't help that various countries have not only decided on different doses and timelines, but the pressure to be fully vaccinated may have resulted in a few people receiving their first dose of a vaccine from one manufacturer, such as Pfizer, and a second dose from another manufacturer, such as Moderna.
For the purposes of this offline question, "I've had two different vaccinations, can I travel?", the CDC has shared formal notice that persons who've received two doses of a vaccine but the first and second dose were manufactured by different companies are not considered fully vaccinated. Read more > HERE
Other requirements such as the period of time between doses and the period of time following your second/final dose remain in place as well.
Again, this is a healthcare matter for your doctor. But if you do fall into this category, you risk being denied boarding for your cruise embarking at a US port of call or for certain flights to destinations bearing similar scrutiny.
While not medical advice - if you do fall into this category, in addition to speaking with your healthcare provider, I might suggest bringing this news to the attention of your travel advisor to find more suitable guidance specific to you and your travel plans.