Well if the fight is at 160, even amateur where you weigh the same day, your opponent will still cut at least 5-10lbs. The question is are you willing to fight a guy weighting 165-170lbs when you're at 150 rn. I'd say it's a significant enough to call it off but that's not me to say. You have a coach?

@H Z Well depends on your experience and the other guy's, do you know anything about him? Indeed you don't wanna be worrying too much about weight but you do need not to ignore it when booking fights, except if you're way out of everybody else's league.