Why does their design changes?

First of all, I wanted to change their style because I get bored drawing the same characters over and over and over again. So I changed them completely, but they are still the Coso and Cosa we loved in Coso 1.

As you can see the mouth of the Originals is very large compared to the ones in Coso 1, their eyes, the colors... Everything is different, but they are always the same as before.

Second of all, in FNaF 2 the withered have different designs as well compared to FNaF 1.

And some of you may say "It's because FNaF 2 is a prequel to FNaF 1", but it doesn't change the fact that their suit is different from the previous game, that's my thought.

Scott could have simply take the FNaF 1 models and added some withered stuff, but he didn't. Probably he wanted to change the design as well, but i'm not him so I dunno.

So, I hope that's clear for you all that Original Coso & Cosa are the same character as Coso & Cosa in FNaCoso 1

See you :)