MN/SE4 & 5 : is it ok to try them on the ground?

I will start SE4 next week and was wondering if I could also train it with my hands flat on the ground or should I stick to parallel bars as I did for the 1/2 sits?

What's the difference between the 2 versions?

Yes doing on the ground is better in some ways as it absolutely guarantees that your legs and hips are lifted to the correct height.

This also means that it is also somewhat harder.

Thanks for the answer, I'll try the mastery on the ground then for the extra challenge

Flat hands is certainly harder, in the sense of being stricter

For comfort I find first knuckle easiest, but it gives me an extra maybe inch of clearance, so whilst it's 'enough' it's not really milking the element in that sense