Cookie / JSESSIONID naming confusion

Hello,

Apologies for the simple question but I was not able to find an answer.
I have a config that directs data based on jsessionid, I have two backends determined by an ACL.
Does the cookie name have to be the same as the server name or do they just have to be unique?

frontend fe_connector_443
    bind *:443 ssl crt /etc/ssl/private/cert.pem alpn h2,http/1.1
    option h1-case-adjust-bogus-client
    mode http
    capture cookie JSESSIONID= len 32
    option forwardfor
    acl internal_range src 192.168.0.0/16
    use_backend internal_source_be if internal_range
    default_backend external_source_be

backend external_source_be
    mode http
    balance roundrobin
    cookie JSESSIONID prefix indirect nocache
    server awc-01 192.168.30.11:443 check cookie s1 verify none ssl alpn h2,http/1.1 
    server awc-03 192.168.30.12:443 check cookie s3 verify none ssl alpn h2,http/1.1 

backend internal_source_be
    mode http
    balance roundrobin
    cookie JSESSIONID prefix indirect nocache
    server awc-02 192.168.30.13:443 check cookie s2 verify none ssl alpn h2,http/1.1

Also do they have to be unique per backend or overall?

Thanks

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