Its in gym sparring? Your weight doesn't matter then.

We just sparred another club and rather than sparring the other fighters who where about 10kg lighter than me, my coach put me in with a Super heavy who was 10kg heavier than me...

Theres no sanctioning or anything, if you give up weight or have a weight advantage then thats thats, you're learning from each other... there is no winner as such so no one has to worry about a weight advantage.

Just aslong as it's safe.