SEO. Keyword cannibalization effect. Promotion of similar pages. Will the second page take some of the weight?

Question

Search Engine Optimization

Hello. Tell me please.
Suppose the site has only one promoted page with 5-6 key phrases. Accordingly, all the weight will be on it.
We are creating another page, another, but similar to the first one, which we will promote, on it 30-40% of key phrases coincide with the first page.
Question: Will the second page take some of the weight? In other words, if the first page in the search was in the top 3, will there be a weight dilution (keyword cannibalization effect) and, accordingly, a decrease in the positions of the first page?

Answer 1

Depends on the situation, I have two almost identical pages ranked top 1-2
But the competition for queries is low

Answer 2

Why do we need these dances with a tambourine?
Collect semantics, cluster, build a structure, and then everything will be clear to you. And there will be no cannibalization.