Stacking is nice because it allows you to have a method for managing both switches together as one logical unit. If you're okay with managing them separately, you'll be able to connect the two switches without issue. You'll need to tag your VLANs for the uplink port(s) on both switches so that you can break them out on the new switch. I'd recommend creating a 20G load sharing group between the switches to reduce bandwidth bottlenecks.
If you're unfamiliar with these processes, it might be a good idea to
open a ticket with GTAC so that someone can take a look at your specific config and help guide you along. They can also help convert your existing config to a "slot:port" arrangement for stacking.