No, contact fusions look specifically for the names of the components. Fusion substitutes like King of the Swamp can 'stand in' for fusion components most of the time, but not when the Fusion Monster specifically says it can only use the listed cards.
Elemental Hero Prisma is different because he does change his name, so can be used for contact fusions. But regular fusion substitutes cannot.
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A Fusion Summon generally consists of two or more Fusion Material Monsters and the Spell Card Polymerization.Some Fusion Summons, such as Contact Fusion, do not require the use of Polymerization and can be fused as directed on the Fusion Monster.
A Fusion Summon is a Special Summon and things that can be used against Special Summons can also be used against a Fusion Summon. But not all Special Summons are Fusion Summons, even if they do so happen to summon a Fusion Monster. For example, Cyber Stein Special Summons a fusion monster, it does not Fusion Summon it.
No, you cannot use Fusion Substitute Monsters for "Future Fusion". You can, however, use Fusion Substitute Monsters for "Chain Material" as long as those Fusion Substitute Monsters exist on your field or hand. The reason Fusion Substitute Monsters cannot be used from your deck is because they have no substitute ability while in the deck and thus cannot be used as replacements for other Fusion Material Monsters.
No, cards like 'Polymerization', 'Future Fusion', and 'Fusion Gate' cannot be used to summon any of the XYZ Fusion Monsters. These Fusion Monsters cannot be Fusion Summoned and requires you to banish the monsters listed on the Fusion Monster from your side of the field in order to Special Summon them.
Yes, you will Special Summon the Fusion Material monsters for the Fusion Monster; as long as the following conditions are met:The Fusion Monster you are targeting was Fusion SummonedAll the monsters used to Fusion Summon must be your GraveyardFor example, if you use De-Fusion on your Blue-Eyes Ultimate Dragon (BEUD), it will be returned to your Extra Deck. Then, if that BEUD was Fusion Summoned and all the monsters used to Fusion Summon it are in your Graveyard, you can Special Summon all of them to your side of the field. This includes Substitute Fusion Material monsters if they were used.If the Fusion Monster was not Fusion Summoned, it will still be returned to the Extra Deck, but no additional monsters will be Special Summoned.These same rules apply to your opponent's Fusion Monster you target with De-Fusion. However, if your opponent is in control of your Fusion Monster when you target it, the Fusion Monster will be returned to your Extra Deck and the Fusion Material monsters will be Special Summoned to your side of the field.