VPN LAN to LAN between Cisco 800 series and Draytek 2600 Vigor

Is this a possible setup?
Is it less reliable than having both routers from the same manufacturer?
Is it more difficult to get working that both routers from the same manufacturer?

My customer already has these 2 routers. I am able to do it easily with 2 draytek routers but I dont want to tell my customer to bin a cisco 800 for a draytek 2600. However my current cisco ios knowledge is limited to how to get into configure mode.
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The beauty of IPSEC is that it is a standard, and as long as both sides adhere to the standards, there should be no problem.
Here's an example for IPSEC on an IOS router to another device..

In the above example, router "light" could just as well be the Draytek.

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