I dont think you can do this as one of the pre requisites for ha is as follows.. The same set of licenses —Licenses are unique to each device and cannot be shared between the devices. Therefore, you must license both devices identically. If both devices do not have an identical set of licenses, they cannot synchronize configuration information and maintain parity for a seamless failover. We have several ha pairs but cannot advise further as always had licences matching. also... I think (at least for vpn gateway license) it is cheaper to purchase one to cover a ha pair than it is to buy one for each. however this may just have been a bit of sales pitch... Perhaps someone else could advise further.
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