Their lore is almost the same:

ZardyDav decided to mix DNA from Godzilla kaijus to create Frankensteins just because he wanted different pets

The Monster X1 has the DNA of:

• Godzilla (Monsterverse and a little bit of shin because he has the same tail as shin)

• Anguirus (showa)

• Mothra (monsterverse)

• Kong (monsterverse)

• Rodan (monsterverse)

And as he is a mix of kaijus he has the same powers, that is, he can have the evolved form of the monsterverse

The Monster X2 has the DNA of:

• Gigan (a little bit of Millenium showa and a little bit of gigan rex)

• Megalon (The one from the 2023 short film)

• Mecha Godzilla ( A little bit of each version of it)

• King Ghidorah (monsterverse)

• And zilla YES ZILLA THE 1998 GODZILLA HIMSELF

They both like to fight but when Zardy looks at them, they behave like Pugs

And their masks are because there was a problem with DNA fusion and that part is a kind of disgusting flesh and can release blue rays, In other words, the masks are to prevent them from getting hurt by the rays

(don't get used to their designs now because I'm thinking about changing their appearance a little to be more "natural". Monster X2 will have a remake where I will change his Godzilla and Zilla mecha DNA to Space Godzilla and Destoroyah but it could also be Monster X instead of Space)

(and I'm also thinking about creating Monster X3 where it would be a mix of jet Jaguar, mecha Godzilla and M.O.G.U.E.R.A. but that will be for another day)