Yeah I get this two, because of my height there are reasonably few guys my weight in my gym. I always spar guys 5+ kilos over my weight.
In fact although I'm 70kg the guys I spar are 76kg, 78kg, 81kg , 83kg and 105kg.
I have a bit of power and maybe I'm overconfident in my ability to bang, but when I spar guys my own weight I feel that I remain in the slower mode I use to spar bigger guys.

Honestly, this sounds a little unfair and against Gym etiquette, but If you spar heavier opposition, you just have to force the pace and do them damage iF YOU WANT TO GET THE MOST OUT OF IT. i'VE FOUND MYSELF HELPING OTHERS OUT IN SPARRING, FIGHTING TO THEIR PACE SO THEY CAN LEARN, BUT FROM NOW ON i JUST HEAT IT UP AND IF THEY CAN'T SPAR AT A PACE THAT BENEFITS ME THEY SHOULDN'T BE SPARRING ME, i NEED TO LEARN TOO.