Is it posible to improve site rankings working only with an other site?

[webtematica]

Hi everyone, i´ll try to explain a situation is happening to me, i´m goint to try to explain the case (im writing the sites without links for explication purposes.

Site 1: Adventurerooms

Site 2: Adventureroomsmallorca

Site 3: Adventureroomsmadrid (the new site)

What happen is that at first there was only Adventurerooms and Adventureroomsmallorca, Adventurerooms was for Madrid and linked to the one in Mallorca too, was kind of giving the information for Madrid but in first page split with a link to Mallorca.

In a new strategy we create Adventureroomsmadrid for Madrid, and leave Adventurerooms for Spain (with links to Adventureroomsmadrid and Adventureroomsmallorca.

We redirect the info for Madrid in Adventurerooms to Adventureroomsmadrid with 301 redirections.

We work during this 3 months in Adventureroomsmadrid making content in the blog, and improving (now Adventureroomsmadrid is Moz 15 (perhaps even more), and Adventurerooms is Moz 10.

Surprising Adventurerooms is getting better in its search rankings, even when we took away content from it and even without working well.

Adventureroomsmadrid is also improving but not as much as Adventurerooms (i know that is a new site, only 3 months), but Adventurerooms gets better results with no content and only DA of 10.

I hope i´ve explain the case with my english so the question is: "Is it posible to improve site rankings working only with an other site?"

Thanks in advance

[webtematica]

Thanks for answering.

i´m not explain myselft well, i´m working in adventureroomsmadrid to improve adventureroomsmadrid, but both are improving even without any job done in adventurerooms.

Adventurerooms is improving without work, now is only a screen with two links (i´m not interesting in improving adventurerooms only interested in adventureroomsmadrid)

[GastonRiera]

Hello there,

Technically, it is possible to improve rankings working on other site. Thar could be only and only because of links pointing from the site being worked to the site to be improved. This is not mathematics, it could work, but there's no garantee.

Im sensing that you're not fully aware of the reasons that would rank a page and even more, that you've skipped reading some resources like:

Begginers guide to SEO - Moz Google’s 200 Ranking Factors: The Complete List - Backlinko.com Search Engine Ranking Factors 2015 - Moz.com How do I build the perfectly optimized page? - Moz blog On-Page SEO: Anatomy of a Perfectly Optimized Page (2016 Update) - Backlinko.com How to Build Backlinks in 2016 (NEW Guide) - GotchSEOc.com

On one hand the fact that adventurerooms get better results is, as you've said, that you've been working on it and there might be more links or a slightly better optimization. 
On the other hand, when you say one is better than other in SERPS, is it for the same keywords? if it is for different kws, are they similar? What about the difficulty for those?
And you also should know that the moz's metrics doesnt strictly indicates that a site is better than other just for a few points in the PA or DA. That metrics, weights and correlates the link profile and some magic behind the courtings.

Hope i've helped.
GR.