<one of warm friendship> <a warm friendship>

[Saki6]

https://i.postimg.cc/Dz9vJLNC/one-of-warm.png

Tea with history: Edith and Eleanor Roosevelt

The seventh annual President’s Day program for 2019 features two Marco Island actresses, Bonnie Bozzo and Judy Daye.

bit.ly

However, our story today is about the wives of those men. The close relationship
between Aunt Edith Roosevelt and her niece Eleanor Roosevelt developed into a
warm friendship that sustained both women.

"relationship ... developed into one of warm friendship"
"relationship ... developed into a warm friendship"
Is there any difference in meaning?

 

[jutfrank]

The two sentences have different structure but the meaning is essentially the same.

 

[teechar]

"relationship developed into one of warm friendship"

The relationship became a relationship characterised/defined by warm friendship.

"relationship developed into a warm friendship

The relationship became a warm friendship.
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You can see that they basically mean the same thing.