Could you please check the router (which has not been replaced) for the ARP entry (show ip arp) for the other side and verify it with the MAC address of the other side (the MAC address of the interface on new router). It may be possible that the ARP entry was not cleared and causing the ping to not go through.
Secondly, it could also be some hardware issue or issue with the SFP (if fiber link) on the new router.
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Is your WAN ready for a multicloud transformation?
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