As long as the hardware is supported by cDOT, it can be converted.
HOWEVER....it is not as simple as reloading. You need to make sure you have enough 10Gig ports
(each node needs at least 2 for the cluster back end, even if you do a switchless 2-node)
You would be best served checking in with your sales team.
You will need new licenses for the cDOT install. You cannot convert those, they need to be done for you.
Your sales team should be able to point you to a doc that walks through the conversion.
Good luck.