Redirect 301 only exact url and not all other sub urls

Dear All,

I'have some urls like these:

https://www.mydomain.com/catalog/category1
https://www.mydomain.com/catalog/category1/product1
https://www.mydomain.com/catalog/category1/product2
https://www.mydomain.com/catalog/category1/product3
...etc...

I have to redirect 301 only

https://www.mydomain.com/catalog/category1
to
https://www.mydomain.com/catalog/newcategory1

and not the other urls.

But if I do

location /catalog/category1 {
return 301 /catalog/newcategory1;
}

nginx redirect all the sub urls with https://www.mydomain.com/catalog/category1 as root to https://www.mydomain.com/catalog/newcategory1

How can I do?

Thank you very much.

Tarichecco