Like Barry says, Full NAT is not the same as DNAT + SNAT.
Full NAT and DNAT both deal with traffic arriving at an interface; SNAT deals with traffic leaving an interface.
Full NAT is DNAT with the Source IP/traffic also changed. It's helpful, for example, if you have two routers and you have a DNAT in the second router; you'll likely want a Full NAT in the first router with a change of the Source-IP to the Internal IP of the first router.
Like Barry says, Full NAT is not the same as DNAT + SNAT.
Full NAT and DNAT both deal with traffic arriving at an interface; SNAT deals with traffic leaving an interface.
Full NAT is DNAT with the Source IP/traffic also changed. It's helpful, for example, if you have two routers and you have a DNAT in the second router; you'll likely want a Full NAT in the first router with a change of the Source-IP to the Internal IP of the first router.