Stairmaster question

[Slayingmetal]

Today was my 1st time trying the stairmaster.
I've been using the elliptical for a few months and It's been working great.
I decided it was time to switch to the stairmaster to up the ante

So here is my question

On the elliptical I burn around 430-460 calories.
Today on the stairmaster I burned 464
But on the stairmaster It was harder and I was drenched in sweat unlike the elliptical.
Am I burning more calories than what it sais on the machine since it's taking more effort
or ?

 

[Slayingmetal]

Or maybe it was harder cus it was mt 1st time using it