Site to Site VPN with Cisco and Asus Routers

I thought I knew a thing or two about VPNs until now. For years, I've had a nice site-to-site VPN with two Cisco SRP527w routers. Now, I have a new router in my home office (Asus RT-AC88U) and I'm confused about my VPN.

The Cisco at the office is configured under the heading of "Site to Site IPSec VPN") with use of an IKE Policy and a IPSec Policy.

The Asus at home offers VPN Client Profiles of PPTP, L2TP or OpenVPN.

Based on that information, am I right in saying these protocols are not compatible? And if so, are there any suggestions for other options?

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