i'm confused, so are you buying your friend's snake or are you buying from the link?If you're buying your friends, did he buy it as a morph? If so then he should already know what it is. when you say "this place says hes a pastel butter" did someone ID it for you or did you just compare it to the picture. If your friend is not sure about what it is, the price he paid for her may be a decent indicator whether its a pastel butter or a mojave if either.
And what do you mean by if it'll be like tyson? Like personality wise? She may be, she may not be. snakes are like people in that every one is a little different. I've got a normal who is little miss chill socialite, while my other one is skittish of me walking by the cage whenever she's out and strikes.