Dear all, recently I had the same problem and even opened TAC ticket.
They said,
===Hello,As we agreed I reached our Developers regarding our question. They confirmed that order of operations matters and first VPG will be used for management and se...
Hello!
Regarding this https://www.openssh.com/releasenotes.html , support of RSA keys < 1024 was deleted.
Looks like one of your router has RSA key with 1024 bits length, second has 2048 or more.
Unfortunately, there is no way to show modulus lengt...