I have an nginx server running with two IP addresses, say 1.2.3.4 and 4.3.2.1. Besides there are two wildcard SSL certificates for *.example.net (i.e. wc1, pointing to 1.2.3.4) and *.sub.example.net (i.e. wc2, pointing to 4.3.2.1).

The nginx docs mention that you can share a wildcard certificate between server instances like this:

ssl_certificate      wc1.crt;
ssl_certificate_key  wc1.key;

server {
    listen           1.2.3.4:443;
    server_name      www.example.net;
    ssl              on;
    ...
}

server {
    listen           1.2.3.4:443;
    server_name      test.example.net;
    ssl              on;
    ...
}

However, I was wondering whether this same construct is possible to use with the second wildcard certificate too. Both domains have around 500 subdomains.

Do they not get mixed up, since the ssl_certificate construct is now global?